Human Heredity: Principles and Issues (MindTap Course List)
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 3, Problem 18QP

More Crosses with Pea Plants: The Principle of Independent Assortment

Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r).

  1. a. Parents: brown eyes, right-handed × brown eyes, right-handed

Offspring: 3/4 brown eyes, right-handed

1/4 blue eyes, right-handed

  1. b. Parents: brown eyes, right-handed × blue eyes, right-handed

    Offspring: 6/16 blue eyes, right-handed

    2/16 blue eyes, left-handed

    6/16 brown eyes, right-handed

2/16 brown eyes, left-handed

  1. c. Parents: brown eyes, right-handed × blue eyes, left-handed

    Offspring: 1/4 brown eyes, right-handed

    1/4 brown eyes, left-handed

    1/4 blue eyes, right-handed

    1/4 blue eyes, left-handed

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Monohybrid Cross: 1) In dogs, wire hair (S) is dominant to smooth (s). a. In a cross between a homozygous wire-haired dog with a smooth haired dog what are the genotypes and phenotypes of the F1 generation? b. If a brother and sister from the F1 generation are crossed what is the expected ratio of wire-haired to smooth-haired dogs produced from this cross?
incomplete dominance   What is the phenotype of the plant with RR genotype?  What is the color of a plant with R'R' genotype? What is the color of a plant with genotype RR'? A pink-flowered snapdragon was crossed with a white-flowered snapdragon. What is the probability of producing a pink-flowered plant? What cross will produce the most pink-flowered plants?

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Human Heredity: Principles and Issues (MindTap Course List)

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