Help please!
Color blindness is a recessive sex-linked human trait. If a color-blind father
and a mother with normal color vision have a color-blind son, what must be
the mother's genotype?
O A. XNY
ОВ. XNXN
O c. XnYn
OD. XNXn

D

Explanation:

If she is the mother, she does not have a Y chromosome. This immediately eliminates answer A and answer C.

Because it is recessive, both the mother and father must possess the recessive gene to pass it on. This eliminates answer B. Therefore it is D.

I hope this helps!!! :)

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