In humans, hemophilia is a sex-linked recessive trait. If a female who is a carrier for hemophilia marries a male with normal blood clotting.
A. What fractio of the female children will have hemophilia?
B. What fraction of the female children will be carriers?
C. What fraction of the male children will have normal blood clotting?
D. What fractio of the male children will have hemophilia?
E. What fraction of the male children will be carriers?
(Nonsense answer = Report)
A. What fractio of the female children will have hemophilia?
B. What fraction of the female children will be carriers?
C. What fraction of the male children will have normal blood clotting?
D. What fractio of the male children will have hemophilia?
E. What fraction of the male children will be carriers?
(Nonsense answer = Report)
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Answer:
A. a 25% chance of having a daughter who has hemophilia.
B. If she gets the X chromosome with the hemophilia gene she will be a carrier. So a carrier's daughter has a 50% chance of being a carrier.
C. a 25% chance of having a son with normal blood clotting
D. a 25% (one in four) chance of having a son with hemophilia.
E. If the son gets his mother's X chromosome with the hemophilia gene he will have hemophilia. If he inherits his mother's other X chromosome, he will have normal blood clotting. So a carrier's son has a 50% chance of having hemophilia.
Explanation:
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