Phenylketonuria, a metabolic disease in humans, is caused by a recessive allele, k. if two heterozygous carriers of the allele (k/+) marry and plan a family of five children, is what is that probability that all of their children will be normal

Answer             If two hereizygous carrier of phenylketonuria marry and plant to give birth to five children, then 25% of child will be normal, 25% affected and 50% carrier.it can also be shown from given below presentation:  Heterozygous carrier x Heterozygous carrier  K/k+.    X.     K/k+ Gametes.   K,k+,k,k+ F1 offspring KK, kk+, kk+,k+k+.

b would be the right answer