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Description: How many different allele combinations can be produced from two parents that are heterozygous for a polygenic trait controlled by three different genes with two allele pairs? Explain.

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How many different allele combinations can be produced from two parents that are heterozygous for a polygenic trait controlled by three different genes with two allele pairs? Explain

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter5: The Inheritance Of Complex Traits

Section: Chapter Questions

Problem 7QP: Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1...

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How many different allele combinations can be produced from two parents that are heterozygous for a polygenic trait controlled by three different genes with two allele pairs? Explain.

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Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1 plants have flowers 15 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 20 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes. a. Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size in this strain of sunflowers? b. How much does each additive allele contribute to flower diameter? c. What size flower makes up the largest phenotypic class?
The amount of enzyme activity in a cell that is homozygous for a mutant allele is 20 units. The amount of enzyme activity in a cell homozygous for the WT allele is 10 units. It is known that 14 units of enzyme activity is required to show the trait. What is the dominance relationship between the WT and mutant allele for the phenotype of amount of enzyme per cell? A) The WT allele is dominant. B) The mutant allele is dominant. C) The WT and mutant alleles are codominant. D) The WT and mutant alleles show incomplete dominance. E) It is impossible to determine from the information given.
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