Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 13, Problem 16PIAT
Summary Introduction
To review:
The advice given by a genetic counselor to pregnant woman about the chances of not having a child with Down syndrome.
Introduction:
Down syndrome is a genetic disorder that occurs due to the presence of an extra copy of a chromosome. A genetic counselor is consulting a 42-year-old woman who has just learned she is pregnant. She knows that Down syndrome births increase with a mother’s age and thus is very worried about her child.
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The shape of radishes may be long (SL/SL), oval (SL/SS), or round (SS/SS), and the color of radishes may be red (CR/CR), purple (CR/CW) or white (CW/CW). If a long, red radish plant is crossed with a round, white plant, what will be the appearance of the F1 and F2 generations?
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Question #3:
In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would
transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming
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apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the parental cross.
b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the…
Chapter 13 Solutions
Biological Science (6th Edition)
Ch. 13 - CAUTION What are homologous chromosomes? a....Ch. 13 - What is an outcome of genetic recombination? a....Ch. 13 - What proportion of chromosomes in a man's skin...Ch. 13 - Nondisjunction that leads to problems in offspring...Ch. 13 - Explain the relationship between homologous...Ch. 13 - If you followed a woman's cells through meiosis,...Ch. 13 - 7. CAUTION Dogs have 78 chromosomes in their...Ch. 13 - Prob. 8TYUCh. 13 - QUANTITATIVE Meiosisresults in independent...Ch. 13 - 10. PROCESS OF SCIENCE A species of rotifer, a...
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