A man and woman are both of normal pigmentation,but both have one parent who is albino (without melanin pigmentation).Albinism is an autosomal (not sex-linked)recessive trait.What is the probability that their first female child will have albinism?

Question

Quizplus · Accepted Answer

Possible gametes of the parents are:

Man: N (normal) x a (albino)
Woman: N (normal) x a (albino)

Thus, their Punnett square would be:

|   | N | a |
|---|---|---|
| N | NN | Na |
| a | Na | aa |

The probability of having an albino child would be 1/4 or 25%, which corresponds to option D.

A Man and Woman Are Both of Normal Pigmentation,but Both