Hemophilia is a sex-linked recessive trait, represented by... a lowercase letter h
an uppercase letter H​

hemophilia is represented by a lowercase h

Explanation:

because it is a recessive trait and not a dominant one

the answer is a lowercase h

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands