Polydactyly is expressed when an individual has extra fingers and/or toes. Assuming 50% 47) penetrance, a man with six fingers on each hand and six toes on each foot marries a woman with a normal number of digits. Having extra digits is caused by a dominant autosomal allele. The couple has a son with normal hands and feet, but the coupleʹs second child has extra digits. What is the probability that their next child will have polydactyly?