Biology: Science for Life with Physiology (5th Edition)
5th Edition
ISBN: 9780321922212
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 2, Problem 3LTB
Summary Introduction
To describe:
The basic tenets of the evolutionary theories.
Introduction:
Evolution is defined as the variation that occurs due to a change in the hereditary characteristics among the biological population over successive generations. Evolution causes biodiversity among the species and individual organisms. The variation among the individuals is due to the presence of different hereditary characters that are inherited from their parents.
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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 2 Solutions
Biology: Science for Life with Physiology (5th Edition)
Ch. 2 - Prob. 1LTBCh. 2 - Prob. 2LTBCh. 2 - Prob. 3LTBCh. 2 - Prob. 4LTBCh. 2 - Prob. 5LTBCh. 2 - Which of the following terms is least like the...Ch. 2 - Different proteins are composed of different...Ch. 2 - Proteins may function as ___________ genetic...Ch. 2 - Prob. 9LTBCh. 2 - Eukaryotic cells differ from prokaryotic cells in...
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