Question

who has hemophilia in the pedigree that is shown?
○ john and ann
○ fred and luke
○ john, charles, jack, and irene
○ ann and marie

Explanation:

In a pedigree, hemophilia (an X - linked recessive disorder) is shown by filled - in symbols. Fred (filled square, \(X^{h}Y\)) and Luke (filled square, \(X^{h}Y\)) have the hemophilia - associated genotypes. Other options have individuals with non - hemophilic genotypes or symbols.

Answer:

B. Fred and Luke