The autosomal (not X -linked) gene for brachydactyly, short fingers, is dominant to normal finger length. Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers. What is the probability that a() their first child will have brachydactyly? b() their first two children will have brachydactyly? c() their first child will be a brachydactylous girl?