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Home Q & A Board Science-Related Homework Help High School Level Science
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jaykhaled_ jaykhaled_
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9 years ago
In humans, the allele for normal blood clotting, H, is dominant to the allele for hemophilia, h. Hemophilia is a X-linked trait.

A hemophiliac female marries a man who is not a hemophiliac. The probability of this couple having a child that is a hemophiliac and the sex that the child would be, respectively, are


0.25; either a female or male affected child

   
0.50; either a male or female affected child

   
0.50; a male affected child

   
0.25; a male affected child
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wrote...
#1
9 years ago
Here, we have to consider the genotype of the mother as XHXh and not XhXh as the latter is a lethal condition where they die after or before birth.

So this is how we work it out..

vector female      *    normal male
XHXh               XHY
XH   Xh            XH   Y

The results :  XHXH , XHY , XHXh , XhY
       normal female, normal male, vector female, haemophiliac male

Hence the answer is, 0.25 a male affected child
wrote...
#2
8 years ago
THANKS! Greatly appreciated! Slight Smile
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