Phenylketonuria is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what is the probability that their first child will be a girl without phenylketonuria?.
the probability is 0/4 because if both of the parents have the recessive allele the only genotype for this would be two recessive alleles and there would be no dominant therefore meaning that the child would have phenylketonuria.
