Hemophilia is an X-linked recessive trait. Consider a cross between a woman who is a carrier and a man who suffers from hemophilia. Which of the following statements is/are true?
I. All sons of these parents will be a hemophiliac.
II. A son who suffers from hemophilia received the hemophilia allele from his mother.
III. Half of the daughters of this cross are predicted to be hemophiliacs.