Question 1 Report
Which of the following is true of the children of a heamophilic man who marries a woman that is not haemophilic and does not carry the trait?
If a man has hemophilia, it means that he has a genetic mutation that affects his blood's ability to clot properly. Hemophilia is a sex-linked disorder, which means that the gene for the disorder is located on the X chromosome. Women have two X chromosomes, while men have one X chromosome and one Y chromosome. If a man with hemophilia marries a woman who is not a carrier of the disorder and does not have any affected family members, then all of their daughters will be carriers of the hemophilia gene, but none of their sons will have hemophilia or be carriers. This is because the daughters will inherit one X chromosome from their father (which has the hemophilia gene) and one X chromosome from their mother (which does not have the hemophilia gene). Since the mother does not have the hemophilia gene, she cannot pass it on to her sons. The sons will inherit their father's Y chromosome (which does not carry the hemophilia gene) and their mother's X chromosome (which also does not carry the hemophilia gene). Therefore, the correct answer is: all their daughters will be carriers.