Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134256283
Author: Audesirk
Publisher: PEARSON
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Chapter 10, Problem 5RQ
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.) What if it had a haploid number of five?
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Describe the events taking place during meiosis? What are the different phases? What is the chromosomal content of the final product? Why must this occur to make a chromosomally viable human?
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?
If a human gamete with a missing chromosome participates in fertilization with a gamete with a normal number of chromosomes, how many chromosomes will the zygote have? Will the zygote be viable? Explain your answer. (Remember, zygotes are diploid)
Chapter 10 Solutions
Biology: Life on Earth (11th Edition)
Ch. 10 - Pairs of chromosomes with almost identical genetic...Ch. 10 - A cell with three or more copies of each...Ch. 10 - During crossing over, a. chromatids of homologous...Ch. 10 - Which of the following does not contribute to...Ch. 10 - Haploid nuclei are first formed at what stage of...Ch. 10 - 1. Meiotic cell division produces _______ (how...Ch. 10 - During _______ of meiosis I, homologous...Ch. 10 - Prob. 3FTBCh. 10 - Prob. 4FTBCh. 10 - Women with __________ syndrome have a single X...
Ch. 10 - Prob. 1RQCh. 10 - 2. Describe crossing over. At which stage of...Ch. 10 - 3. In what ways are mitosis and meiosis similar?...Ch. 10 - 4. Diagram and describe the three main types of...Ch. 10 - Describe how meiosis provides for genetic...Ch. 10 - Define nondisjunction, and describe common...Ch. 10 - 1. Many plants can reproduce sexually or...
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- Explain how the random alignment of homologous chromosomes during metaphase I contributes to variation in gametes produced by meiosis.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_forwardCompare meiotic anaphase I with meiotic anaphase II. Which meiotic anaphase is most similar to the mitotic anaphase?arrow_forward
- For which of the following is the number the same in humanmales and females?(A) interruptions in meiotic divisions(B) functional gametes produced by meiosis(C) meiotic divisions required to produce each gamete(D) different cell types produced by meiosisarrow_forwardWhich of the following correctly describes the gametes that will form as a result of nondisjunction during anaphase II in a human male? a. Two sperm with 24 chromosomes and two sperm with 22 chromosomes b. Two sperm with 23 chromosomes, one sperm with 22 chromosomes, and one sperm with 24 chromosomes c. Four sperm with 24 chromosomes d. Four sperm with 22 chromosomesarrow_forwardIn human spermatogenesis, mitosis of a stem cell gives rise to one cell that remains a stem cell and one cell that becomes a spermatogonium. Draw four rounds of mitosis for a stem cell and label; the daughter cells. For one spermatogonium, draw the cells it would produce from one round of mitosis followed by meiosis. Label the cells, and label mitosis and meiosis. What would happen if stem cells divided like spermatogonia?arrow_forward
- Name two key functions of meiosis.arrow_forwardIf nondisjunction of the sex chromosomes takes place in meiosis I in the male, what sexual phenotypes and proportions of offspring will be produced?arrow_forwardDefine gamete and zygote. What number of chromosomes does each have (in humans)?arrow_forward
- Please explain what would be the consequences in successive generations of offspring if the chromosome number were not reduced during meiosis?arrow_forwardAssuming that independence assortment occurs during meiosis what types of gametes will form individuals with the following genotypes?arrow_forwardDraw a diagram of Metaphase I and II of meiosis in the father, which illustrates the only possible way in which the father’s chromosomes could have aligned during Metaphase I, and in the subsequent Metaphase II in the same cell, in order to have resulted in the conception of the specific son who has all three of these genetic conditions (achondroplasia, color blindness and deafness).arrow_forward
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General Embryology Review in 20 minutes; Author: Medical Animations;https://www.youtube.com/watch?v=4YKvVeVMmEE;License: Standard youtube license