Question

based on the pedigree that is shown, which describes john?
carrier for hemophilia
expresses hemophilia
does not have hemophilia
expresses hemophilia and died of complications

Explanation:

Hemophilia is an X - linked recessive disorder. Males have one X and one Y chromosome. If a male has the recessive allele on his X chromosome (in this case, \(X^{h}\)), he will express the disorder because there is no second X chromosome to mask the recessive allele. In the pedigree, the purple - colored males (like Fred and the son of Charles and Marie) are affected. Since John is represented in a way that is consistent with the affected males (assuming the purple color indicates the disorder in males as per typical pedigree conventions for X - linked recessive disorders where males with the recessive allele show the trait).

Answer:

expresses hemophilia