Campbell Biology Concepts And Connections - 10th Nasta Edition
10th Edition
ISBN: 9780136646099
Author: Taylor, Simon, Dickey, Hogan, Reece
Publisher: PEARSON
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Chapter 26, Problem 10TYK
SCIENTIFIC THINKING The results of Tyrone Hayes’s experiments (Module 26.3) were published in a top peer-reviewed journal, yet the validity of his experiments has since been challenged. Using external sources, find out who has challenged the results.
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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
there was just one gene conferring gametophytic obligate apomixis, and that the two parents are
inbreds, what would be the consequences of such a cross if:
a) The apomixis was a dominant 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 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…
Question #5:
Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The
genes show independent assortment. Recessive alleles at both loci are required for the facultative
apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C.
At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype.
A facultative apomict male, capable of producing viable pollen, was crossed with a sexually
reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic
ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following
temperatures*:
a) 15°C?
b) 25°C?
*for full credit, show crosses and genotypes where appropriate. Remember to position the
female first (left side) in the cross.
Type your answer here:
Chapter 26 Solutions
Campbell Biology Concepts And Connections - 10th Nasta Edition
Ch. 26 - Complete this map, which presents some major...Ch. 26 - Which correctly matches a hormone to the gland...Ch. 26 - The body is able to maintain a relatively constant...Ch. 26 - Prob. 4TYKCh. 26 - List three ways endocrine glands are stimulated to...Ch. 26 - Prob. 6TYKCh. 26 - If a person has a pituitary tumor that is...Ch. 26 - Which two of the hormones listed below act upon...Ch. 26 - A strain of mice remains healthy as long as they...Ch. 26 - SCIENTIFIC THINKING The results of Tyrone Hayess...
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