Biology: Life on Earth
10th Edition
ISBN: 9780321729712
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: Benjamin Cummings
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Chapter 9, Problem 12RQ
Describe how meiosis provides for genetic variability. If an animal had a haploid number of two (no sex chromosomes), how many genetically different gametes could it produce? (Assume no crossing over.) If it had a haploid number of five? LO12
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Chapter 9 Solutions
Biology: Life on Earth
Ch. 9 - Fill-in-the-Blank The genetic material of all...Ch. 9 - Fill-in-the-Blank Genetically identical offspring...Ch. 9 -
2. Prokaryotic cells divide by a process called...Ch. 9 - Growth and development of eukaryotic organisms...Ch. 9 - Fill-in-the-Blank Most plants and animals have...Ch. 9 - The four phases of mitosis are _______, _______,...Ch. 9 - Prob. 7FTBCh. 9 - Prob. 8FTBCh. 9 - Fill-in-the-Blank During__________ of meiosis I,...Ch. 9 - Fill-in-the-Blank Three processes that promote...
Ch. 9 - Prob. 1RQCh. 9 - Prob. 2RQCh. 9 -
2. Define mitosis and cytokinesis. What changes...Ch. 9 - Diagram the stages of mitosis. How does mitosis...Ch. 9 - Define the following terms: homologous chromosome...Ch. 9 -
5. Describe and compare the process of...Ch. 9 - How is the cell cycle controlled? Why is it...Ch. 9 - Diagram the events of meiosis. At which stage do...Ch. 9 - Prob. 9RQCh. 9 - In what ways are mitosis and meiosis similar? In...Ch. 9 - Describe or diagram the three main types of...Ch. 9 - Describe how meiosis provides for genetic...Ch. 9 - Most nerve cells in the adult human central...Ch. 9 - Cancer cells divide out of control. Side effects...Ch. 9 - Some animal species can reproduce either asexually...
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- Because of the ________ alignment of homologous chromosomes during meiosis, gametes can end up with _________ mixes of maternal and paternal chromosomes. a. unvarying; different b. unvarying; duplicate c. random; duplicate d. random; differentarrow_forwardThe chromosome constitution number of this individual is 2=6. This drawing represents: a. mitotic metaphase. b. meiotic metaphase I. c. meiotic metaphase II. d. a gamete. e. sixnonhomologous chromosomes.arrow_forwardIt is possible that an alternative mechanism for generating germ cells could have evolved. Consider meiosis in a germ cell precursor (a cell that is diploid but will go on to make gametes). If the S phase were skipped, which meiotic division (meiosis I or meiosis II) would no longer be required?arrow_forward
- Adams maternal and paternal chromosomes have alternate forms of a gene that influences whether a person is right-handed or left-handed. One form says right and its partner says left. Visualize one of Adams spermatogonia, in which chromosomes are being duplicated prior to meiosis. Visualize what happens to the chromosomes during anaphase I and II. (It might help to use toothpicks as models of the sister chromatids of each chromosome.) What fraction of Adam's sperm will carry the gene for right-handedness? For left-handedness?arrow_forwardAneuploidies are deleterious for the individual because of what phenomenon? a. nondisjunction b. gene dosage c. meiotic errors d. X inactivationarrow_forwardA cell (2n = 4) has undergone cell division. Daughter cells have the following chromosome content. Has this cell undergone mitosis, meiosis I, or meiosis II?arrow_forward
- An individual with XY chromosomes produces gametes where 50% have an extra sex chromosome and 50% have no sex chromosomes. Given this information, what is the probability a fertilized egg will have the genotype XO? Assume that the egg has the expected 23 chromosomes prior to fertilization. 1/3 1/2 1/8 1/4 It is not 1/3 or 1/4arrow_forwardWhich statement does not accurately describe what occurs during the process of meiosis? A) All stages of meiosis follow DNA replication. B) Meiosis produces gametes with the haploid chromosome number. C) Meiosis produces four identical gametes, either egg or sperm. D) Genetic variation among sexually reproducing organisms is enhanced by meiosis. Not Gradedarrow_forwardWhat type of gametes can be produced by simple non-disjunction of the sex chromosomes in a human male? Simple non-disjunction means that non-disjunction occurs in meiosis I or meiosis II, but not in both meiosis I and meiosis II. Choose all answers that are correct Group of answer choices 22, 0 24, YY 25, XXY 23, XX 23, XY 25, XXX 24, XY 24, XXarrow_forward
- How would the mutation of a single chromosome in metaphase 1 of meiosis affect the process of meiosis? Use a simple cell with two chromosomes, what is the ratio of gametes with the mutation vs without the mutation?arrow_forwardName two key functions of meiosis.arrow_forwardAt the end of meiosis in humans, four gametes are produced that are: A. Genetically identical to each other and to the parent cell B. Genetically identical to each other but genetically different from the parent cell C. Genetically different from each other and the parent cell D. Genetically identical to the parent cell from different from each otherarrow_forward
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