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 4, Problem 17QP

Analysis of X-Linked Dominant and Recessive Traits

A young boy is color-blind. His one brother and five sisters are not. The boy has three maternal uncles and four maternal aunts. None of his uncles’ children or grandchildren is color-blind. One of the maternal aunts married a color-blind man, and half of her children, both male and female, are color-blind. The other aunts married men who have normal color vision. All their daughters have normal vision, but half of their sons are color-blind.

  1. a. Which of the boy’s four grandparents transmitted the gene for color blindness?
  2. b. Are any of the boy’s aunts or uncles color-blind?
  3. c. Is either of the boy’s parents color-blind?
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The allele for color-blindness is carried on the X chromosome. Making color blindness (a recessive trait) an X - linked trait. A colorblind make and a carrier female for color blindness. (But is not colorblind herself) have a child. Show your work! A) what is the % chance that their son will be color blind? B) what is the % chance that their daughter will be color blind?
Recessive hemophilia, x-linked. The man has it, and his wife is a carrier. Draw a Punnett square to show this. What is the probability that their daughter has hemophilia? What is the probability that their son does?
Number of FEMALE offspring that would have the condition of an X-linked trait, if an affected man and a carrier woman had children

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Human Heredity: Principles and Issues (MindTap Course List)

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