OBJECTIVE LIFE SCIENCE
GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Hemophilia is a sex-linked recessive trait found on the x chromosome. Complete a cross between a woman who has hemophilia and a normal man.What are the chances of a child having hemophilia?
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100%
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75%
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50%
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25%
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Explanation:
Detailed explanation-1: -Hemophilia is & sex-linked recessive trait in humans If a father and & son are both hemophiliacs; but the mother Is normal; her genotype must be: 0 Xhy XhXh 0 XhXh XHXH.
Detailed explanation-2: -An X-linked recessive means that a female requires mutated genes on both X chromosomes, while a male requires only one mutated gene located on the X chromosome. So, women can be both carriers and affected.
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