BIO genetic question

[i4everpaki]

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A woman who is seemingly normal marries a normal man. the woman's father is a hemophiliac. what is the probability that the couple's son will have hemophilia?

25%
50%
75%
100%
0%

since hemophiliac is X-linked, the woman will have XX', and if she marries a man who is normal XY. their offspring will be XX, XX', X'Y, and XY. the probability their son will have hemophilia is going to be 25%? right. 1/2 of son X 1/2 of hemophilia = 1/4. the destroyer's ans is 50%. what do you think?

 

[rjnst7]

I believe they are stating the child is a male taking the probability of male or female out of the equation, making it 50% that the son will have hemophilia (either has it or doesn't), if I am reading the question correctly. If the child's sex is unknown and it were asking the probability of it being a male and having hemophilia then 25% would be correct.

 

[i4everpaki]

oh ok, so i guess the question is just asking about males. then it makes sense. thanks

 

[dentalWorks]

A woman who is seemingly normal marries a normal man. the woman's father is a hemophiliac. what is the probability that the couple's son will have hemophilia?

 

[bobu]

I think 50% is correct. b'c asked for boy.

 

[i4everpaki]

thanks, i understand it. i was just reading the question wrong.