Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 10.2, Problem 1CSC
The Rainbow Connection
As Tess and Chris Giddings produced eggs and sperm, meiosis separated their homologous chromosomes. Let's assume that Tess has only "pale hair” alleles for all of the genes that might contribute to hair color, but that Chris has alleles for both dark and pale hair. During egg formation in Tess's ovaries, crossing over and separating the homologues wouldn't make any difference for the hair color genes, and all of her eggs would contain only pale hair alleles. For Chris, on the other hand, crossing over and separating the homologues would matter a lot. Some of his sperm might receive a dark hair allele for one gene, but a pale hair allele for another gene. Other sperm would have different combinations of dark and pale hair alleles, including some sperm with all pale hair alleles and others with all dark hair alleles. Can this diversity of sperm and eggs explain the diversity of the Giddings children?
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Imagine a germ cell for an animal that is 2n=4. Gene A and B are found on chromosome one, and the cell is homozygous for A(AA) and heterozygous for Bb. Gene D is found on chromosome 2 and the germ cell is heterozygous for the Allee of the gene (Dd). Meiosis for this germ cell results in the following four gametes, and one crossing over event during meiosis ABD, ABd, AbD, Abd.
Draw the chromosomes in cell during metaphase of meiosis 1. Make sure to include chromosomes, the allele in the correct locations on the chromosomes AFTER the crossing over event, and spindle fibers.
Jeff's spermatogonium (precursor sperm cell before meiosis) looks like the cell on the left (only four chromosomes are shown. Assume all the other chromosomes behaved normally).
After meiosis, Jeff makes a sperm that looks like the cell on the right.
Assume the A/a and F/f genes are near the centromere where crossing over is suppressed. When did a nondisjunction event occur to create this sperm?
In fruit flies, chromosomal crossing over does not occur in meiosis in males, whereas crossing over does occur in meiosis in females. In fruit flies that are heterozygous at many genes (i.e. many maternal and paternal versions of the genes differ), at what stage would cells no longer be heterozygous for any gene during the process of meiosis?
a)After the second meiotic division in males, and after the first meiotic division in females.
b)After the second meiotic division in both males and females.
c)After the first meiotic division in both males and females.
d)After the first meiotic division in males, and after the second meiotic division in females.
Chapter 10 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 10.1 - The Rainbow Connection The genetic variability or...Ch. 10.1 - Prob. 1CYLCh. 10.1 - Prob. 2CYLCh. 10.1 - Prob. 3CYLCh. 10.2 - The Rainbow Connection As Tess and Chris Giddings...Ch. 10.2 - describe the steps and outcome of meiotic cell...Ch. 10.2 - Prob. 1HYEWCh. 10.2 - What would be the consequences for the resulting...Ch. 10.2 - Prob. 2CYLCh. 10.2 - What would be the genetic consequences for the...
Ch. 10.2 - Prob. 3TCCh. 10.3 - explain how meiosis and sexual reproduction...Ch. 10.4 - compare and contrast the three main types of...Ch. 10.5 - Prob. 1CSRCh. 10.5 - Prob. 1CTCh. 10.5 - Prob. 1CYLCh. 10.5 - describe some of the human genetic disorders that...Ch. 10 - Many plants car. reproduce sexually or asexually....Ch. 10 - Meiotic cell division produces ________ (how many)...Ch. 10 - Pairs of chromosomes with almost identical genetic...Ch. 10 - Prob. 1RQCh. 10 - Prob. 2FIBCh. 10 - Prob. 2MCCh. 10 - Prob. 2RQCh. 10 - Prob. 3FIBCh. 10 - Prob. 3MCCh. 10 - Prob. 3RQCh. 10 - Prob. 4FIBCh. 10 - Prob. 4MCCh. 10 - Diagram and describe the three main types of...Ch. 10 - Prob. 5FIBCh. 10 - Prob. 5MCCh. 10 - Describe how meiosis provides for genetic...Ch. 10 - Define nondisjunction, and describe common...
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