In biology, evolution is the change in the inherited traits of a population from generation to generation. These traits are the expression of genes that are copied and passed on to offspring during reproduction. ... Genetic drift arises from the role chance plays in whether a given individual will survive and reproduce.
Heredity - This is the passing on of traits from parents to their offspring either through sexual reproduction or asexual reproduction.
Ok, so I'm not sure if the man affected with fh has Ff alleles or FF alleles. However, I think by the question that he has Ff alleles. So there is a 50% chance that the offspring will be affected by fh.
