Mutations in the genes for clotting factor VIII and IX cause hemophilia A and B, respectively. A Woman may be heterozygous for mutations in both genes with a mutated factor VIII allele on one X chromosome, and a mutated factor IX allele on the other. All or her sons should have either hemophilia A or B. However, on rare occasions, one of these women gives birth to a son who does not have hemophilia, and his one X chromosome does not have either mutated allele. Explain.

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
BuyFind

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter 14, Problem 9GP
Textbook Problem

Mutations in the genes for clotting factor VIII and IX cause hemophilia A and B, respectively. A Woman may be heterozygous for mutations in both genes with a mutated factor VIII allele on one X chromosome, and a mutated factor IX allele on the other. All or her sons should have either hemophilia A or B. However, on rare occasions, one of these women gives birth to a son who does not have hemophilia, and his one X chromosome does not have either mutated allele. Explain.

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