A woman who is a carrier for royal hemophilia (a sex-linked recessive trait) marries a man who does not have hemophilia. On average, what is the chance they will have a daughter with hemophilia? What is the probability that they will have a son with hemophilia?
A woman who is a carrier for royal hemophilia (a sex-linked recessive trait) marries a man who does not have h
0 girls
1/2 boys
Reply:Haemophilia is a recessive X linked gene. This means that it can only arise in her sons as they will have only one X chromosome. Since the gene is only on one of her two X chromosomes, each child has a 50% chance of receiving it. No daughter can suffer from haemophilia, but each will have a 50% chance of carrying it like their mother.
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