Hemophilia is a sex-linked recessive disorder. Males express hemophilia more commonly than females. Why is this the case?
a
The gene for hemophilia is located on the Y chromosome.
b
The presence of a gene on the Y chromosome makes the individual express this disorder (epistasis).
c
Males only have a single X chromosome and there is no counterpart for the hemophilia gene on the Y chromosome.
d
Men are almost always carriers of sex-linked disorders.

Question

Hemophilia is a sex-linked recessive disorder. Males express hemophilia more commonly than females. Why is this the case?
 a
The gene for hemophilia is located on the Y chromosome.
 b
The presence of a gene on the Y chromosome makes the individual express this disorder (epistasis).
 c
Males only have a single X chromosome and there is no counterpart for the hemophilia gene on the Y chromosome.
 d
Men are almost always carriers of sex-linked disorders.

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@faithkristine