Tay Sachs Disease Is Caused by a Recessive Mutation on Chromosome

Multiple Choice

Tay Sachs disease is caused by a recessive mutation on chromosome 15,and 1 of every 27 members of the Old Order Amish community of Pennsylvania carry a recessive allele.What is the chance that an Old Order Amish man who carries the allele will have a child with Tay Sachs? (Remember,the community restricts marriage to other members of the community. )

A) 1/4 (25%) chance
B) 1/27 (3.7%) chance
C) 100% chance
D) 1/27 × 1/4 (0.926%) chance
E) 1/2 (50%) chance