Ataxia in humans is conditioned by the recessive autosomal (a t) allele, normal coordination by (a t +). A normal woman has children with an ataxic man. Their first child is ataxic.
a. What are the genotypes of:
Woman?
Man?
Child?
b. What is the probability that their next child would be an ataxic?
c. Two normally coordinated individuals have an ataxic child. Propose 2 explanations.