AIIMS 2013 Biology Question Paper for free online practice with solutions

In family A, if both the parents are homozygous recessive, then both should be diseased and should have 100% diseased progeny. In family B, if both parents are homozygous dominant, they would not have got the recessive disease in first place. In family B, if both are.heterozygous recessive, then also they would not have got the disease, neither 80% of progeny would be diseased.