QUESTION 24 Hemophilia is an X-linked recessive trait. A man and a woman do not

Question

QUESTION 24 Hemophilia is an X-linked recessive trait. A man and a woman do not suffer from hemophilia but the their second child also suffers from the disorder and is female? ouple's first and third children do. What is the probability that a. 100% Obs0% 0425% Oe, 75% QUESTION 25 Which of the following is true of an X-linked recessive trait? 0 a Man affected female mates with an unaffected male 100% of their sons will be affected. b. lf an affected male mates with an unaffected (noncarrier) female 50% of their daughters will end up being carriers. Oc None of the options is correct. dr an affected male mates with an unaffected (carrier) female 25% of their children will have the disease Oe t is not possible for a female to be affected by an X-linked recessive trait

Explanation / Answer

11. Option C is correct.
From the given information, it is clear that the woman is a carrier for the recessive disease-causing allele. Since males obtain X-chromosome from their mother and the mother is heterozygous, 50% of the boys will be affected. None of the girls are affected as they inherit WT allele from their father.
Parental cross: XHXh X XHY
Progeny: XHXH XHY XHXhXhY

12. Option A is correct.

Parental cross: XhXh X XHY
Progeny: XHXhXhY XHXhXhY

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