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If a woman is a carrier for hemophilia and has a child with a man who does not have hemophilia, what percentage of their sons would be expected to have hemophilia? What percentage of their daughters would be expected to be carriers of the gene for hemophilia? Ideas are expressed.

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This job examines hemophilia and the X chromosomes.

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Since hemophilia is a defect in a gene on the X chromosome, it's considered to be sex-linked. The disease is recessive, so for a female to be affected she would need to have the defective gene on both of her X chromosomes - one from her mother and one from her father. This is fairly rare. For a male to have the disease, he only needs the defective gene on his single X chromosome (that ...

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