Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 5, Problem 22QP
Height in humans is controlled by the additive action of genes and the action of environmental factors. For the purposes of this problem, assume that height is controlled by four genes—A, B, C, and D—and that there are no environmental effects. Assume further that additive alleles contribute two units of height and partially additive alleles contribute one unit of height.
- a. Given these assumptions, can two individuals of moderate height produce offspring that are much taller and shorter than either parent? If so, how can this happen?
- b. Can someone of minimum height and someone of intermediate height have children taller than the parent of intermediate height? Why or why not?
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Height in humans depends on the additive action of genes. Assume that this trait is controlled by the four loci R, S, T, and U and that environmental effects are negligible. Instead of additive versus non-additive alleles, assume that additive and partially additive alleles exist. Additive alleles contribute 2 units, and partially additive alleles contribute 1 unit to height.
Can two individuals of moderate height produce offspring that are much taller or shorter than either parent? What is the percentage of offspring which manifest transgressive variation?
Express answer in percentage form.
Significant # of decimal places for answer: 2
Assume that the length of a type of cucumber at maturity is controlled by two genes (A and B), each of which has two alleles. The A and B alleles each add 3 inches of cucumber growth, while the a and b alleles add only 1 inches. If a plant with genotype Aabb is crossed to a plant with genotype AaBb, what ratios of lengths are expected in the progeny?
1/8-12”, 3/8-10”, 3/8-8”, 1/8-6”
1/2-8”, 3/8-6”, 1/8 4”
1/8-10”, 3/8-8”, 3/8-6”, 1/8-4”
1/2-12”, 3/8-10”, 1/8 8”
1/2-10”, 3/8-8”, 1/8 6”
Assume that plant height is determined by a pair of alleles at each of two loci (A and a, B and b) that are additive in their effects. Further assume that each allele represented by an uppercase letter contributes 6 feet to height and that each allele represented by a lowercase letter contributes 2 foot to height. If a plant with genotype Aabb is crossed to a plant with genotype aaBb, what heights are expected in the progeny?
1/216ft : 1/2 12ft
1/4 16ft : 1/2 12ft : 1/4 8ft
1/4 20ft : 1/2 16ft : 1/4 12ft
1/4 24ft : 1/2 20ft : 1/4 16ft
1/2 20ft : 1/2 16ft
Chapter 5 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
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