Incontinentia pigmenti, a rare, X-linked dominant disorder inhumans, is characterized by swirls of pigment in the skin. If anaffected female, who had an unaffected father, has children with anunaffected male, what are the predicted ratios of affected andunaffected sons and daughters?

Incontinentia pigmenti, a rare, X-linked dominant disorder inhumans, is characterized by swirls of pigment in the skin. If anaffected female, who had an unaffected father, has children with anunaffected male, what are the predicted ratios of affected andunaffected sons and daughters?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter4: Pedigree Analysis In Human Genetics

Section: Chapter Questions

Problem 17QP: Analysis of X-Linked Dominant and Recessive Traits A young boy is color-blind. His one brother and...

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Incontinentia pigmenti, a rare, X-linked dominant disorder in
humans, is characterized by swirls of pigment in the skin. If an
affected female, who had an unaffected father, has children with an
unaffected male, what are the predicted ratios of affected and
unaffected sons and daughters?

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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. a. Which of the boys four grandparents transmitted the gene for color blindness? b. Are any of the boys aunts or uncles color-blind? c. Is either of the boys parents color-blind?
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Assume that a trait is determined by an X-linked dominant gene. Ifthe mother exhibits the trait but the father does not, then theira. sons are more likely than their daughters to exhibit the trait.b. daughters are more likely than their sons to exhibit the trait.c. sons and daughters are equally likely to exhibit the trait
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