Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 25, Problem 24ESP
In a series of crosses between two true-breeding strains of peaches, the F1 generation was uniform, producing 30-g peaches. The F2 fruit mass ranges from 38 to 22 g at intervals of 2 g.
- (a) Using these data, determine the number of polygenic loci involved in the inheritance of peach mass.
- (b) Using gene symbols of your choice, give the genotypes of the parents and the F1.
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1) A cross is made between two plants differing in four independently-assorting gene loci, AABBCCDD x
aabbccdd, to produce an F, which is then self-fertilized. If the capital letters represent alleles with a
completely dominant phenotypic effect,
(a) how many different genotypes are possible in the F;?
(b) what proportion of the F; will be homozygous dominant for all genes?
(c) what proportion of the F; would have an ABCD phenotype?
2) Would your answers to (a), (b), and (c) be different if the initial cross were AAbbCCdd x aaBBccDD?
Two plants with white flowers, each from true-breeding strains, were crossed. All the F1 plants had red flowers. When these F1 plants were intercrossed, they produced an F2 consisting of 177 plants with red flowers and 142 with white flowers.
(a) Propose an explanation for the inheritance of flower color in this plant species.
(b) Propose a biochemical pathway for flower pigmentation and indicate which genes control which steps in this pathway.
Genes a and b are 20 cM apart. An a+ b+/a+ b+ individual was mated with an a b/a b individual.(a) Diagram the cross and show the gametes produced by each parent and the genotype of the F1.(b) What gametes can the F1 produce, and in what proportions?(c) If the F1 was crossed to a b/a b individuals, what off-spring would be expected, and in what proportions?(d) Is this an example of the coupling or repulsion link-age phase?(e) If the F1 were intercrossed, what offspring would be expected, and in what proportions?
Chapter 25 Solutions
Concepts of Genetics (12th Edition)
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