Question

Hemophilia is caused by _____.

Answer 1

Answer: a recessive allele on the X chromosome

explanation: Hemophilia is caused by a mutation or change, in one of the genes, that provides instructions for making the clotting factor proteins needed to form a blood clot. This change or mutation can prevent the clotting protein from working properly or to be missing altogether. These genes are located on the X chromosome.

Answer 2

Hemophilia is caused by a recessive allele on the X chromosome.