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How do hemophiliac parents pass the trait on to their offspring?

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Explain why a woman carrying the gene for hemophilia can produce two hemophiliac sons when she mates with a normal male.

What is the probability that a parent carrying a dominant trait will pass that trait on to each child?

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Solution Summary

The expert explains why a women carrying the gene for hemophilia can produce two hemophiliac sons when she mates with a normal male. The probability that a parent carrying is dominant trait will pass that trait on to each child.

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Unlike dominant genetic diseases, hemophilia is not associated with somatic genes but rather sex-linked genes. There are two chromosomes that are sex-linked, the X and Y. Females have two X chromosomes (XX) and males have one X and one Y (XY). As a result, females who have a defective X chromosome have another which may compensate. Males only have one, therefore will present any deficits their X chromosome carries. This ...

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