Genetic Analysis: An Integrated Approach (3rd Edition)
Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 5, Problem 22P

T. H. Morgan’s data on eye color and wing form, shown in Figures 5 .3 and 5 .5, reveal genetic linkage between the two genes. Test this genetic linkage data with chi-square analysis, and show that the results are significantly different from the expectation under the assumption of independent assortment.

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A large ear of corn has a total of 433 grains, including 271 Purple & starchy, 73 Purple & sweet, 63 Yellow & starchy, and 26 Yellow & sweet. Calculate the chi-squared value for the null hypothesis that the ear of corn was produced by a dihybrid cross (PpSs x PpSs) involving the null hypothesis that the two genes are not linked for color and sweetness. Explain the chi-square test results.
Seed weight in a particular plant species is determined by pairs of alleles attwo loci (a+ a− and b+ b−) that are additive and equal in their effects. Plantswith genotype a− a− b− b− have seeds that average 1 g in weight, whereasplants with genotype a+ a+ b+ b+ have seeds that average 3.4 g in weight. Aplant with genotype a− a− b− b− is crossed with a plant of genotype a+ a+ b+b+.a. What is the predicted weight of seeds from the F1 progeny of this cross?b. If the F1 plants are intercrossed, what are the expected seed weights andproportions of the F2 plants?
When a chi square analysis is applied to solve a linkage problem,explain why an independent assortment hypothesis is proposed?

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Genetic Analysis: An Integrated Approach (3rd Edition)

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