Hemophilia is caused by a sex-linked recessive allele.This means that __________.
A) women can be carriers but cannot get hemophilia
B) the gene is found on the Y chromosome
C) a man can give the allele to his son but not to his daughter
D) a son who has hemophilia inherited the allele from his mother
E) a son who has hemophilia inherited the allele from his father

Question

Quizplus · Accepted Answer

Hemophilia is a genetic disorder caused by mutations in genes located on the X chromosome. Since males (XY) have only one X chromosome, a single recessive allele on the X chromosome will result in hemophilia. Therefore, a son with hemophilia must have inherited the affected X chromosome from his mother, as fathers pass on their Y chromosome to sons.

Hemophilia Is Caused by a Sex-Linked Recessive Allele