Phenylketonuria is an inherited disease caused by a recessive autosomal allele. if a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl? phenylketonuria is an inherited disease caused by a recessive autosomal allele. if a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl?

a. 3/8
b. 1/4
c. 1/16
d. 3/16

The ans will be

Explanation:

As phenylketonuria is a recessive autosomal disease, and both the parents are carrier, so they both carry one defective gene and one good gene.

If they produced 4 children, the probability of diseased and non diseased child will be as follows.

diseased:

non diseased:  

And the probability of male and female child will be .

So, the probability of phenotypically normal first girl child will be × ⇒

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

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