Campbell Essential Biology (6th Edition) - standalone book
6th Edition
ISBN: 9780133917789
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Chapter 8, Problem 12PS
A mule is the offspring of a horse and a donkey. A donkey sperm contains 31 chromosomes and a horse egg has 32, so the zygote has 63. The zygote develops normally. However, a mule is sterile, meiosis cannot occur normally in its testes or ovaries. Explain why mitosis is normal in cells containing both horse and donkey chromosomes, but the mixed set interferes with meiosis.
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The horse has a diploid set of 64 chromosomes, and a donkey has a diploid set of 62 chromosomes. Mules (viable but usually sterile) are produced when a male donkey is mated to a female horse. How many different chromosomes will a mule somatic (body) cell contain? Explain your answer.
In human spermatogenesis, mitosis of a stem cell gives rise to one cell that remains a stem cell and one cell that becomes a spermatogonium. (a) Draw four rounds of mitosis for a stem cell, and label the daughter cells. (b) 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. (c) Explain what would happen if stem cells divided like spermatogonia.
Explain why the daughter cells produced by meiosis NEED to be genetically different from each other, whereas the daughter cells produced by mitosis NEED to be identical.
Chapter 8 Solutions
Campbell Essential Biology (6th Edition) - standalone book
Ch. 8 - Which of the following is not a function of...Ch. 8 - In what sense are the daughter cells produced by...Ch. 8 - Why is it hard to observe individual chromosomes...Ch. 8 - A biochemist measures the amount of DNA in cells...Ch. 8 - What phases of mitosis are opposite in terms of...Ch. 8 - Complete the following table to compare mitosis...Ch. 8 - If an intestinal cell in a dog contains 78...Ch. 8 - A micrograph of a dividing cell from a mouse shows...Ch. 8 - Prob. 9SQCh. 8 - Prob. 10SQ
Ch. 8 - Although nondisjunction is a random event, there...Ch. 8 - A mule is the offspring of a horse and a donkey. A...Ch. 8 - Prob. 13PSCh. 8 - Interpreting Data The graph shows the incidence of...Ch. 8 - If an endangered species can reproduce by...Ch. 8 - Prob. 16BSCh. 8 - The practice of buying and selling gametes,...
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- Genes on the same chromosome tend to stay together during _____ and end up in the same ______. a. mitosis; body cell b. mitosis; gamete c. meiosis; body cell d. meiosis; gamete e. both a and darrow_forwardAlternative forms of the same gene are called _________ . a. gametes c. alleles b. homologous d. sister chromatidsarrow_forwardIf a muscle cell of a typical organism has 32 chromosomes, how many chromosomes will be in a gamete of that same organism? a.8 b. 16 c. 32 d. 64arrow_forward
- imagine a giraffe whose diploid is 30. A)Under what circumstances would the giraffe go through a process of meiosis? . b) what will be the final result of this meiosis for the giraffe (# of cells + # of chromosomes/cells)arrow_forwardA Common Wombat has 14 chromosomes in one of its somatic cells. One of these cells goes into meiosis. How many cells result, and how many chromosomes does each one of these cells have?arrow_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
- In meiosis, each centromere has a spindle fiber attached only to one side. In mitosis, each centromere has a spindle attached to how many sides?arrow_forwardA diploid male organism has two homologous chromosomes. A and B are from its maternal parent, while A’ and B’ are from its paternal parent. Draw the chromosomes at the following stages: a, anaphase of mitosis b. anaphase of the first meiotic division c, anaphase of the second meiotic division If the same chromosomes were involved in meiosis in a female, would the kind of egg nuclei produced be different from the sperm nuclei? Why?arrow_forwardWhen 23 pairs of human chromosomes are arranged in a diploid set, this layout is called a _____arrow_forward
- Nondisjunction produces daughter cells with an imbalance of chromosomes. A cell biologist examines the final products of meiosis in a mouse with 24 chromosomes (2n) and finds 2 gamete cells with 13 chromosomes, and 2 gamete cells with 11 chromosomes. Most likely this was because...arrow_forwardA meiotic-nondisjunction causes trisomy 8 in a newborn. If two of the three copies of chromosome 8 are identical, at what point during meiosis did nondisjunction take place? Explain how you arrived at this answer.arrow_forwardDuring meiosis, cells undergo two rounds of nuclear and cell division, but only one round of DNA synthesis. Describe the main differences between anaphase of mitosis and anaphase I in meiosis. Why are these differences important for meiosis to occur correctly?arrow_forward
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