A boy with recessive X- linked hemophilia is born from an unaffected mother and a father with hemophilia. From which parent was the disease allele inherited?

Question

Quizplus · Accepted Answer

Since hemophilia is an X-linked recessive disorder, a boy can only inherit the affected X chromosome from his mother, as he inherits a Y chromosome from his father, which does not carry the gene for hemophilia.

A Boy with Recessive X- Linked Hemophilia Is Born from an Unaffected