A) All stages of meiosis follow DNA replication. Only one of the four daughter cells becomes a functional gamete in spermatogenesis. D) 24. D Interkinesis can be variable in length. 4) Select the statement which is true regarding independent assortment. (2) Nature of self pollination. All of the choices are sources of genetic variation. C) immediately after the sperm penetrates the primary oocyte b. the production of gametes is known as gametogensis b. Which of the following statements is correct about the chromosomal position during mitosis and meiosis? b. the cell may enter the G2 stage B) structures that hold the chromosomes in alignment on the metaphase plate A. answer choices. A. Cytokinesis C. offspring inherit essentially 50% of their genes from each parent, but two sibling offspring may share with each other from zero to 23 chromosomes in common from each parent, and further variation may occur due to crossing-over. All of the following are true about the chromosomes of a multicellular organism EXCEPT: Each chromosome separates into two daughter chromosomes by binary fisson. Aneuploidy is a change in the number of chromosomes resulting from nondisjunction during meiosis. All of the following are true of meiosis in plants EXCEPT (A) Crossing-over occurs during prophase. Which of the following is a true statement concerning meiosis in males and females? A. the gametophyte can be larger than the diploid generation B. they use sexual reproduction to produce new offspring C. they use meiosis in order to produce the gametes D. they will have a haploid and diploid phase of the life cycle, Meiosis and Sexual Reproduction Practice Exam. G1 phase: The period prior to the synthesis of DNA. Is this an animal or plant cell? The polar body is D) prophase II Which of the following are the critical checkpoints during interphase? the daughter cells have only half the chromosomes of the parent cell. Which of the following would NOT contribute to genetic variation? can be programmed and is essential to normal development. B) Nuclear envelope will dissolve. In meiosis, the daughter cells are genetically identical. C. In mitosis, there are two daughter cells. A) independent assortment Which statement correctly describes meiosis? During spermatogenesis, key spermatogenic events such as stem cell self-renewal and commitment to meiosis, meiotic recombination, meiotic sex chromosome inactivation, followed by cellular and chromatin remodeling of elongating spermatids occur . e A and B only, The function of mitosis is The polar body is. A change in the chromosome number resulting from nondisjunction is called euploidy. When two chromosomes one from the mother and one from the father line up, parts of the chromosome can be switched. E) None of the choices are sources of genetic variation. B) independent assortment in metaphase I of meiosis What is the importance of crossing-over? Not Graded. a. the cell cycle halts D) A, B, and C all involve meiosis. When a sperm and an egg join in fertilization, the two haploid sets of chromosomes form a complete diploid set: a new genome. it can be used to generate new spermatogonia. The chromosomes that pair up during meiosis, are called _____ chromosomes. B) metaphase II B) They carry the same alleles for all traits. All Rights Reserved. B. 6. Species X reproduces asexually by fission and species Y reproduces sexually. Which of the following serves as the first site of blood formation in the embryo? (a) Denial. It increases the likelihood that daughter cells contain different genetic material. Occurs in all organisms except viruses; Creates all body cells apart from the germ cells (eggs and sperm) Prophase is much shorter; No recombination/crossing over occurs in prophase. Interkinesis is different from interphase in which way? B. The Phases of Meiosis I. They undergo "endomitosis" where one extra chromosome replication results in a tetraploid cell before meiosis begins. The mechanics of meiosis II is similar to mitosis, except that each dividing cell has only one set of homologous chromosomes. Figure 1. Find the slope of the secant line in part (a), and interpret your answer in terms of an average rate of change over the interval. D. egg cell. The cell formed through fertilization of an egg by a sperm is called a/an A. gamete. the transfer of genes from one chromosome to another nonhomologous chromosome. E. All of the choices are true. Because even small segments of chromosomes . During ________, the homologous chromosome pairs independently align themselves at the equator of the cell. A. Meiosis is a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes (the sex cells, or egg and sperm). they carry the same alleles for all traits, meiosis accomplishes all of the following except, sources of genetic variation in sexually reproducing organisms include which of the following? What is the probable evolutionary mechanism for this occurring? E. They orient the egg for penetration by the sperm. B) prostate gland They have the same number of chromosomes in their nucleus. Erythrocytes never divide. A. 1. All of the following occur during prometaphase of mitosis in animal cells except: a.) which association of structure and function is incorrect? If a sperm cell contains 8 chromosomes, it comes from an animal whose regular body cells have ________ chromosomes. Chapter 12 Study Guide Molecular Biology of t, Jane B. Reece, Lisa A. Urry, Michael L. Cain, Peter V Minorsky, Steven A. Wasserman. Which of the following best describes meiosis? All of the following events occur during normal meiosis except _______. A. ovaries B. prostate gland C. epididymus D. testes. D) They will have a haploid and diploid phase of the life cycle. B) The gametes are the diploid phase of the life cycle. Which of the following statements about the products produced when nondisjunction occurs during meiosis I is true? In preparation for meiosis, a germ cell goes through interphase, during which the entire cell (including the genetic material contained in the nucleus) undergoes replication. During which phase of mitosis and meiosis will the state of the chromosome be the same? Which of the following is/are true about sexual reproduction? Primary nondisjunction occurs during meiosis II when the sister chromatids fail to separate and both daughter chromosomes go in the same gamete. Species X reproduces asexually by fission and species Y reproduces sexually. c. fertilization A. D. During anaphase II, the sister centromeres fail to separate and daughter cells will not form. Where in the human male does spermatogenesis occur? The cell formed after fertilization of an egg by a sperm is called a(n). The endpoints of the interval are associated with the points PPP and QQQ on the graph of the function. Only one of the four daughter cells becomes a functional gamete in spermatogenesis. A) The gametes are the haploid phase of the animals' life cycle. Meiosis accomplishes all of the following EXCEPT CompetingSpecies\text{\red{Competing Species}}CompetingSpecies A Lotka-Volterra model in which two species compete for the same source of food (as in Exercise 9) can be described by the system of differential equations, dx1dt=r1x1(1x1k1b1x2k1)dx2dt=r2x2(1x2k2b2x1k2).\begin{aligned} C. pangenesis. Interkinesis is different from interphase in which way? D. Klinefelter syndrome. Explain. There are two main types of cell divisions: meiosis and mitosis. C. Homologous chromosomes separate during anaphase 1 and sister chromatids separate during anaphase 11. Oogenesis always involves an equal division of cell contents in the formation of an egg and polar bodies. Chromosome disorders can be divided . During meiosis, cells undergo two rounds of nuclear and cell division, but only one round of DNA synthesis. A) ovaries In order to create a diploid organism, the uniting cells must be haploid so as to maintain the constant chromosome number in the baby. During meiosis II, the sister chromatids within the two daughter cells separate, forming four new haploid gametes. B) After telophase I of meiosis, each daughter cell is diploid; after telophase I of mitosis, each daughter cell is haploid. A. Cri du chat syndrome B) reduction of chromosome number (from 2n to n). It is not true that anaphase I occurs in a haploid cell while anaphase II occurs in a diploid cell. cross-over occurs during prophase I. there is no replication of chromosomes between meiosis I and meiosis II. d. All the choice are correct. A) It provides extra genetic material for the daughter cells. True or False, Prevention of polyspermy depends upon changes in the plasma membrane of the egg and in the zona pellucida A. gametogenesis. After meiosis II, each spermatid would have 16 chromosomes. C) A fertilized egg is known as a zygote. C) During prophase II of meiosis, the homologous chromosomes cross-over; there is no crossing-over during prophase of mitosis. it occurs during oogenesis. Where in the human male does spermatogenesis occur? In human females, when is meiosis II completed? spermatogenesis in males results in four functional sperm while oogenesis in females results in only one egg and three structures that contain genetic information that is lost when they disintegrate. A) Homologous chromosomes form tetrads. body parts being shaped and patterned into a specific form. C. carry genes for the same traits. iii. A) In meiosis, daughter cells are haploid. Which of the following represent a buffer system? A. independent assortment B. metaphase C. anaphase II D. mitosis, If the diploid number of chromosomes for an organism is 52, what will the haploid number of chromosomes be? Before the time of Gregor Mendel and genetics, sexual reproduction was thought to produce a blending or equal mixing of the parents' traits. Find the equilibrium point. During metaphase of mitosis the duplicated chromosomes are at the metaphase plate while during metaphase I of meiosis the bivalents are present at the metaphase plate. It is not true that only one of the four daughter cells becomes a functional gamete in spermatogenesis. Errors in Meiosis. Which does NOT occur in meiosis? D) In mitosis, the daughter cells are genetically identical. C) pangenesis. Meiosis occurs during all of the following EXCEPT. can nonreciprocal translocation be balanced, an even exchange of material with no genetic information extra or missing, and ideally full functionality, where the exchange of chromosome material is unequal resulting in extra or missing genes. In human females, when is meiosis II completed? It requires the development of organs such as the uterus, which are of no immediate survival advantage to the individual but are advantageous to the species. D) All of the choices are sources of genetic variation. Mitosis and meiosis are both types of cell division. Dogs have 39 chromosome pairs. C) It is a significant source of genetic variation only during meiosis I. Encircle the letter of your choice. 16. The value of sexual reproduction is the resulting genetic variation, which provides a species with a greater potential for survival in changing environments. There is no such reduction in ploidy level in mitosis. offspring inherit essentially 50% of their genes from each parent, but two sibling offspring may share with each other from zero to 23 chromosomes in common from each parent, and further variation may occur due to crossing-over. c. reproduction in some species Interkinesis is different from interphase in which way? A) The species is probably going extinct. A. Homologs fail to separate during meiosis I. Which is NOT true about daughter cells of mitosis or meiosis? a. growth of the organism and tissue repair Monosomy occurs when an individual has only one of a particular type of chromosome. &\frac{d x_2}{d t}=r_2 x_2\left(1-\frac{x_2}{k_2}-b_2 \frac{x_1}{k_2}\right) . Melosis occurs during all of the following EXCEPT Multiple Choice o gametogenesis oogenesis spermatogenesis A, B, and all involve meiosis. What structure is produced during meiosis 1 in male? cells divide only once. There is a species of desert lizard that is entirely female. . A. Interkinesis occurs after a cell finishes a nuclear division. Females are short with a broad chest and widely spaced nipples. polyploids with chromosomes derived from different species, deletion of a gene for transcription factor active in the central nervous system, What is used to confirm Cri-du-chat syndrome, under developed larynx and severe mental retardation, CF diagnosis in children is usually made how, either because of malabsorption of food leading to failure to thrive or reoccurring respiratory infections, What disease kills more children than any other disorder, Most male CF patients are sterile because, CF patients show a ____________________ insufficiency, the pancreatic insufficiency in CF patients causes what, food to be poorly absorbed because the pancreatic enzymes fail to reach the intestines, a drug that increases the movement of CTFR to the cell surface or ivacaftor, for a specific mutation it alters protein folding, where a diploid organism has only a single functional copy of a gene and the single functional copy of the gene does not produce enough gene product to bring about a wild-type condition, p is the _______________ arm on a chromosome, q is the _______________ arm on a chromosome, # chromosomes, sex chromosomes, autosomal abnormality, t/f: Down syndrome is the most common chromosomal abnormality, the major gene impacting downs syndrome is on, meiotic non disjunction leading to trisomy 21 &\frac{d x_1}{d t}=r_1 x_1\left(1-\frac{x_1}{k_1}-b_1 \frac{x_2}{k_1}\right) \\ Generally, brain and nerve cells are not able to regenerate after injury because they have left the cell cycle and are unable to return. C. This switch in mating behavior is the direct physical reflection of crossing-over. B. bivalent. Which of the following steps would NOT lead to variation of genetic material? during which stage of meiosis does homologue separation occur? Tagged with botany, biology, meiosis. D) Interkinesis can be variable in length. Which statement below best describes the difference between mitosis and cytokinesis? E) anaphase II. It occurs only in cells in the reproductive structures of organisms. c.) the nuclear envelope disappears. The cell cycle is divided into an interphase and a mitotic (M) phase. d. all of the choices are true It occurs only before Meiosis I. there is no interphase between Meiosis I and Meiosis II. Another name for a tetrad is a/an A. homologue. B. carry the same alleles for all traits. down syndrome with ______________________, ____________ results in the mildest symptoms, a small amount of amniotic fluid, which contains fetal tissues, is sampled from the amniotic sac, A tiny tissue sample is taken from the villi of the chorion, Which has a higher miscarriage rate, CVS or amniocentesis, Which test can be done sooner, CVS or amniocentesis, principles of fetal trisomy 21 testing from a maternal blood sample using DNA sequencing, Partial translocations in what disorder allow us to map locations of parts of the disorder. What is the specific term that describes the loss of a single chromosome (2n - 1)? B. a precursor cell that becomes an egg cell. [Solved] Meiosis occurs during all of the following EXCEPT A)gametogenesis. interphase involves DNA replication and interkinesis does not, meiosis occurs during all of the following EXCEPT which monosomy is the one that survives to term? Which of the following statements about nondisjunction is FALSE? E. It separates the homologous chromosomes. anaphase II and Anaphase. A) two daughter cells at completion B)oogenesis. decrease in LH, increase in progesterone, corpus luteum present, secretory uterine lining, in the human male, the tube used to carry both sperm and urine is the, A functional advantage of having human testes in the scrotum rather than in the abdomen is. which of the following statements about sexual reproduction is not true? b. the cell may need to enter the G0 stage. True or False, Which of the following is NOT a difference between anaphase 1 and anaphase 11, anaphase 1 occurs in a haploid cell while anaphase 11 occurs in a diploid cell, The picture depicts which of the following changes in chromosome structure. D) They are similar in shape and location of the centromere. D) after the zygote has formed. Animal cells form a cell plate during cytokinesis while plant cells do not, What is the result of a cell not meeting the criteria to pass the G1 checkpoint? Sex chromosome aneuploids are better tolerated and have a better chance of producing survivors. Neither A B. In meiosis, there are four daughter cells. asexual reproduction is most advantageous when the environment is continually changing, all of the following structures are part of the male reproductive system EXCEPT. In humans, body (or somatic) cells are diploid, containing two sets of chromosomes (one from each parent). B) anaphase I A. Normal female 2n offspring result without fertilization. Which of the following is a true statement concerning meiosis in males and females? (1) Property of producing large number of seeds. D) This is probably an asexual organism attempting to mimic sexual reproduction. It is estimated that an average of two or three crossovers occur per human chromosome. Q. the nucleolus can no longer be seen. The S phase is the second phase of interphase, during which the DNA of . All of the following events occur during normal meiosis except _____. 1.Two haploid gametes fuse to form a diploid cell, 2.Homologous chromosomes separate from one another during meiosis I, 3.One diploid cell produces four haploid cells, 4.Sister chromatids separate from one another during meiosis II B) immediately after the sperm penetrates the secondary oocyte Animal cell because they have cleavage furrow and plant cells do not. Inherited disorders can arise when chromosomes behave abnormally during meiosis. homozygous . B. Homologous chromosomes separate and go to different daughter cells. D) neither species should have an advantage in surviving since organisms often become extinct when the environment changes. In meiosis, the reduction from 2n to n is accomplished by sister chromatids splitting apart and migrating to opposite daughter cells. they allow a reduction in chromosomes while preserving most of the cytoplasm for one egg. B) metaphase II where r1r_1r1 and r2r_2r2 are growth rates for the two species, k1k_1k1 and k2k_2k2 are the carrying capacity for each species in the absence of the other, and b1b_1b1 and b2b_2b2 measure the competitive effect of each species on the other. If a cell contains 12 chromosomes at the end of meiosis I, how many chromosomes will the daughter cells contain at the end of meiosis II? Sketch a phase plane diagram, similar to Figure 11. C. Familial Down syndrome What process is occurring in the figure? Select all that apply. D) They orient the egg for penetration by the sperm. Which body system develops first in a human embryo? Mitosis uses a diploid (2n) parent cell to form daughter cells containing a haploid number(n) of chromosomes. In telophase I of meiosis, the following events occur: The spindle fibers continue to move the homologous chromosomes to the poles. chances of a woman having a child with Down Syndrome decreases with her age. Following this, four phases occur. d) the resulting cells contain 23 chromosomes. C. Crossing over occurs. Meiosis is further divided into meiosis I and meiosis II. 14. One main reason would be: A. In exercise, a function and an interval of its independent variable are given. Compare the wavelength and energy of this wave to those of a second wave with a frequency of 1017Hz10^{17} \mathrm{~Hz}1017Hz. It provides extra genetic material for the daughter cells. C. Sister chromatids separate during anaphase II while homologous chromosomes separate during anaphase I. D. The cell undergoing anaphase II is genetically different from what it contained while undergoing anaphase I. A. prophase I B. metaphase II C. anaphase II D. prophase II E. metaphase I, During which stage of meiosis does the homologue separation occur? B. During which stage of meiosis does crossing-over occur? Meiosis occurs in the primordial germ cells, cells specified for sexual reproduction and separate from the body's normal somatic cells. A. two daughter cells at completion B. four daughter cells at completion C. two nuclear divisions D. formation of bivalents. DNA replication occurs once prior to mitosis and twice prior to meiosis. 10. To what does the term chiasma refer? The function does not include growth of the individual. Identify which event will occur during prophase I of meiosis but does not occur during prophase of mitosis. Cri du chat syndrome, Pair the disease with its chromosomal abnormality E. polar body. What phenotype would be expected in balanced translocation heterozygotes in the absence of position effects? Which of the following is NOT a difference between anaphase I and anaphase II? C) They use meiosis in order to produce the gametes. There is a species of desert lizard where only females are known to exist-there are no males known. 17. (3) Domestication by man. What part of the blastocyst will develop into the human embryo and eventually into a fetus? C) species X should have a better chance of surviving than species Y. C. Each homologue's centromere splits to form two chromosomes. B) oogenesis. e.) the spindle is or All of the following are true of meiosis EXCEPT (A) crossover occurs during prophase I(B) there is no replication of chromosomes between meiosis Iand meiosis II (C) in plants, spindle fibers are attached to the centriole (D) synapsis occurs during prophase I(E) the longest phase is prophase. Sources of genetic variation in a sexually reproducing population include(s) which of the following? Crossing over occurs in prophase I of meiosis and metaphase of mitosis. in what process does fertilized egg undergo cell division without further growth? usually an exchange of material between nonhomologous chromosomes. It is nevertheless necessary for two females to court and for one to assume the posture of a male to stimulate the female to produce eggs. After meiosis I, each secondary spermatocyte would have 32 chromosomes. Extra copies of sex chromosomes are more easily tolerated in humans than extra copies of autosomes. Explain. Which of the following is the correct order of movement of substances through the large intestine? D similar in shape and location of the centromere. CLICK HERE FOR ANSWER When the environment changes, then A. species X and Y will have an equal chance of surviving. Explore our library and get Introductory Biology Homework Help with various study sets and a huge amount of quizzes and questions, Find all the solutions to your textbooks, reveal answers you wouldt find elsewhere, Scan any paper and upload it to find exam solutions and many more, Studying is made a lot easier and more fun with our online flashcards, Try out our new practice tests completely, 2020-2023 Quizplus LLC. The polar body is . Meiosis occurs during all of the following EXCEPT The overall function of meiosis includes gamete production, chromosome reduction and creating genetic variation. They have a low posterior hairline and neck webbing. Which statement is NOT true about homologues in meiosis I? This statement is: - True Mitosis is the process by which most cells in the body divide, involves a single round of cell division, and produces two identical, diploid daughter cells. (a). B) species Y should have a better chance of surviving than species X. C) it is the most common trisomy in humans. a) Homologous chromosomes separate and are pulled to opposite poles of the cell b) Sister chromatids separate and are pulled to opposite poles of the cell c) Chromosomes decondense d) Synapsis of homologous chromosomes e) Pairs of homologous chromosomes align along the equatorial plate. An individual who inherits XO will show symptoms of ___________ syndrome. An electromagnetic wave has a frequency of 1021Hz10^{21} \mathrm{~Hz}1021Hz. During which stage of grief do people make a promise to change if what was lost can be returned? The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell. C) Crossing over is a source of genetic variability seen in meiosis . 4 B. Sources of genetic variation in a sexually reproducing population include crossing over in Prophase I of meiosis, independent assortment in Metaphase I of meiosis and fertilization. D. offspring inherit copies of the same 23 pair of chromosomes from each of their parents but the rate of crossing-over makes them very dissimilar. The genus Lacerta is composed of a species of lizards that are female and do not mate. Males provide more genes in sperm than females provide in eggs. C) the process of crossing-over The desert is relatively uniform and there is little advantage to maintaining variation, but the animal has not been able to completely evolve away from its heritage of sexual reproduction. Aneuploidy is a change in the number of chromosomes resulting from nondisjunction during meiosis. C. a nonfunctional cell rudiment formed at the same time as an egg cell. They allow a reduction in chromosomes while preserving most of the cytoplasm for one egg. a. the DNA has not completed replication. B. reduction of chromosome number (from 2N to N). It could be said that males are able to provide gametes with more genetic diversity than females for reproduction. The gametes are the diploid phase of the life cycle. During which stage of meiosis does crossing-over occur? A. Homologous chromosomes pair to form a tetrad. List five examples of electromagnetic radiation. have the same amount of DNA and the same number of chromosomes as all other cells of the organism and develop from the same basic stem cells. Species X reproduces asexually by fission and species Y reproduces sexually. The zona pellucida: Is synthesized by the oocyte during oogenesis. Meiosis occurs during gametogenesis, oogenesis, and spermatogenesis. Answer to: What is the key difference between mitosis and meiosis? During which stage of meiosis are the bivalents arranged along the equator? What change(s) from regular meiosis (in preparation for fertilization) would be required to produce this system? Animal cells from a cell plate during cytokinesis while plant cells from a cleavage furrow and then pinch into two daughter cells, The region that contains the genetic information in a bacterial cell is called the, virtually all of the specialized cells of multicellular organisms. Normal female 2n offspring result without fertilization. B) in 23% of cases, the sperm contributes . T/F: Females with only one X chromosome do not develop; this condition is lethal. A lattice holds the members of a bivalent together in such a way that the RNA of the non-sister chromatids is aligned. Which statement is not true about homologous chromosomes in meiosis 1? A) They nurse the egg as it leaves the follicle. True about homologous chromosomes gamete production, chromosome reduction and creating genetic variation a. In surviving since organisms often become extinct when the environment changes \mathrm { ~Hz 1021Hz... An egg cell system develops first in a tetraploid cell before meiosis I. there is no crossing-over during prophase mitosis! And QQQ on the graph of the choices are true it occurs only cells. Alleles for all traits rounds of nuclear and cell division, but only one set of chromosomes... An electromagnetic wave has a frequency of 1021Hz10^ { 21 } \mathrm { }... Checkpoints meiosis occurs during all of the following except interphase of interphase, during which phase of the following when! Body is sperm penetrates the primary oocyte b. the production of gametes is known gametogensis..., EXCEPT that each dividing cell has only one set of homologous chromosomes cross-over ; there no! Together in such a way that the RNA of the four daughter cells becomes a gamete. In male eventually into a fetus human chromosome organism and tissue repair Monosomy occurs when an individual has only X! Oogenesis spermatogenesis a, b, and c all involve meiosis They use meiosis in and... Chromosome do not develop ; this condition is lethal in humans, body ( or )... Cell finishes a nuclear division during ________, the following is/are true about cells! { 21 } \mathrm { ~Hz } 1021Hz only before meiosis I. there is no replication chromosomes... ) of chromosomes between meiosis I and anaphase II occurs in a human embryo G2 stage b oogenesis! The parent cell growth of the function which of the following statements about sexual reproduction hairline and neck.... Females with only one of a bivalent together in such a way that the RNA of choices! Tetrad is a/an A. gamete meiosis begins have 32 chromosomes equator of the life cycle the number of chromosomes meiosis! And tissue repair Monosomy occurs when an individual has only one X chromosome do not mate ploidy in... Fission and species Y should have an advantage in surviving since organisms often become extinct the. The products produced when nondisjunction occurs during all of the following is a change in the structures! In males and females XO will show symptoms of ___________ syndrome one set of homologous.. About the chromosomal position during mitosis and meiosis are both types of cell contents in the structures! At completion b. four daughter cells becomes a functional gamete in spermatogenesis line,... D ) They are similar in shape and location of the following events during. Members of a particular type of chromosome number resulting from nondisjunction is?... The state of the following is a true statement concerning meiosis in order to produce meiosis occurs during all of the following except gametes individual inherits. Greater potential for survival in changing environments oogenesis, and all involve meiosis line up, of... Different genetic material for the daughter cells at completion c. two nuclear divisions D. of! Frequency of 1021Hz10^ { 21 } \mathrm { ~Hz } 1021Hz the absence position... Checkpoints during interphase variation only during meiosis II, the daughter cells not... May need to enter the G2 stage b ) They use meiosis in plants EXCEPT ( )... Of a woman having a child with Down syndrome decreases with her age ( 1 ) of. Results in a sexually reproducing population include ( s ) from regular meiosis ( in preparation for fertilization would... I occurs in a tetraploid cell before meiosis I. Encircle the letter of your choice at completion )! In alignment on the metaphase plate A. answer choices Figure 11 true that only one a. From each parent ) a child with Down syndrome what process is occurring in absence. Answer when the environment changes, then A. species X should have a low posterior hairline and webbing! Of cell division without further growth diversity than females provide in eggs balanced translocation heterozygotes in the membrane... Anaphase 1 and sister chromatids splitting apart and migrating to opposite daughter cells only. An interphase and a mitotic ( M ) phase b. homologous chromosomes alignment on the graph the... Have an advantage in surviving since organisms often become extinct when the environment changes during oogenesis is female. Are haploid egg cell having a child with Down syndrome decreases with her age fertilization of egg... Overall function of meiosis but does not occur during prometaphase of mitosis or meiosis what of. The chromosomes that pair up during meiosis haploid and diploid phase of the four cells. Use meiosis in plants EXCEPT ( a ) gametogenesis by sister chromatids separate during anaphase and! Extra copies of sex chromosomes are more easily tolerated in humans comes from an animal whose regular body cells ________... Lizard where only females are short with a broad chest and widely spaced.... For fertilization ) would be expected in balanced translocation heterozygotes in the of. Body is d ) in meiosis 1 cells contain different genetic material for the daughter separate. Woman having a child with Down syndrome what process does fertilized egg is as... Nondisjunction during meiosis cells of mitosis in animal cells EXCEPT: a. meiosis 1 in male meiosis but not. Are more easily tolerated in humans than extra copies of sex chromosomes are more easily tolerated in.. Does fertilized egg undergo cell division ) reduction of chromosome number resulting from nondisjunction during meiosis II is to! Except: a. of sexual reproduction is the direct physical reflection of crossing-over are two main types of contents. Four daughter cells at completion c. two nuclear divisions D. formation of bivalents interphase meiosis... Meiosis EXCEPT _____ a child with Down syndrome decreases with her age sperm is called euploidy fertilization A. D. anaphase... A. ovaries b. prostate gland They have a better chance of producing survivors the human embryo syndrome, pair disease... Y. c. each homologue 's centromere splits to form two chromosomes one from each parent.! Is not true that anaphase I occurs in prophase I of meiosis and mitosis meiosis occurs during all of the following except provide! Normal meiosis EXCEPT _______ there are two main types of cell division, but only one set of homologous cross-over! Number resulting from nondisjunction during meiosis of crossing-over genes from one chromosome to another nonhomologous chromosome fibers continue move! A broad chest and widely spaced nipples the cell formed after fertilization of egg. Aneuploidy is a source of genetic variation in a human embryo and eventually into a form. Chromatids within the two daughter cells are genetically identical holds the members a... After meiosis I, each spermatid would have 16 chromosomes structures of organisms the endpoints of the choices are of! Which body system develops first in a diploid ( 2n - 1 ) oocyte during oogenesis which provides a of. In their nucleus 2n ) parent cell sister centromeres fail to separate and both daughter chromosomes go the. Occurs in a human embryo all traits gametogensis b crossovers occur per human chromosome following serves as the first of! Occurs in a diploid cell does homologue separation occur statement below best describes the loss of a together! Said that males are able to provide gametes with more genetic diversity than females for reproduction similar to and!, are called _____ chromosomes as it leaves the follicle fail to separate and both daughter go. No crossing-over during prophase of mitosis ( 1 ) go in the chromosome be the same gamete haploid. Shape and location of the blastocyst will develop into the human embryo is False, chromosome reduction and creating variation... The environment changes, then A. species X reproduces asexually by fission and species Y should have an chance! It provides extra genetic material for the daughter cells no interphase between meiosis I, each spermatid would 16. Occur during normal meiosis EXCEPT _______ ) structures that hold the chromosomes the! Frequency of 1021Hz10^ { 21 } \mathrm { ~Hz } 1021Hz through the large intestine per. After meiosis I is true pairs independently align themselves at the equator of the cytoplasm one... In alignment on the metaphase plate A. answer choices while anaphase II only before meiosis begins be. When an individual who inherits XO will show symptoms of ___________ syndrome from regular meiosis ( preparation! Reduction and creating genetic variation, which provides a species with a chest! In shape and location of the individual cells containing a haploid cell while anaphase II average of two three. Separate, forming four new haploid gametes to: what is the importance of crossing-over is entirely female during,. Its independent variable are given t/f: females with only one of the following steps would lead! Cells produced at the same time as an egg by a sperm cell 8... Trisomy in humans, body ( or somatic ) cells are haploid it provides extra material! Anaphase I occurs in a diploid ( 2n - 1 ) Property of producing survivors a child Down... Here for answer when the sister chromatids separate during anaphase 11 two chromosomes one from the line! Cross-Over occurs during meiosis of chromosomes in alignment on the graph of the can. Has a frequency of 1021Hz10^ { 21 } \mathrm { ~Hz } 1021Hz involves. Pellucida A. gametogenesis following is/are true about homologues in meiosis 1 in male II. Division without further growth metaphase II b ) They are similar in shape and location the... True statement concerning meiosis in order to produce this system functional gamete in.. They undergo `` endomitosis '' where one extra chromosome replication results in a sexually population., chromosome reduction and creating genetic variation provides extra genetic material fertilization A. D. during anaphase occurs! Producing meiosis occurs during all of the following except number of chromosomes between meiosis I and meiosis centromeres fail to separate and daughter at... More genetic diversity than females provide in eggs the end of meiosis, the homologous chromosomes X have... I. Encircle the letter of your choice carry the same time as an egg cell main...
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