Aman with huntington disease (he is heterozygous hd hd+) and a normal woman have two children. a. what is the probability that only the second child has the disease? b. what is the probability that only one of the children has the disease? c. what is the probability that none of the children has the disease? d. answer (a) through (c) assuming that the couple had 10 children. e. what is the probability that 4 of the 10 children in the family in (d) have the disease?