GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If a woman is a carrier for a sex linked recessive trait of hemophilia and her husband has hemophilia, which of the following is true? Make a punnett square!
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All sons will have hemophilia
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all daughters will have hemophilia
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50% of daughters and 50% of sons have hemophilia
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100% of sons have hemophilia and 100% of daughters are carriers
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Explanation:
Detailed explanation-1: -A man who has hemophilia and a woman who is a carrier have: a 25% (one in four) chance of having a son with hemophilia.
Detailed explanation-2: -So, the correct answer is ‘50% sons will have haemophilia’.
Detailed explanation-3: -Hemophilia is a sex-linked recessive disorder. The abnormal gene responsible for hemophilia is carried on the X chromosome. Males have one X chromosome and one Y chromosome.
Detailed explanation-4: -A female who is a carrier has a 50-50 chance that each male child will have hemophilia. There is a 50-50 chance that each female child will be a carrier (Picture 2).
There is 1 question to complete.