Bob and Linda are a newly married couple.They hope to have a child but are having trouble getting pregnant.They visit a fertility clinic,where they receive a variety of tests.One test shows that Bob is healthy but carries a single disease-causing allele for CFTR (the gene that can cause cystic fibrosis),but Linda does not.This means that

Question

Quizplus · Accepted Answer

Bob carrying a single disease-causing allele for CFTR while Linda does not implies that Bob's DNA sequence for CFTR is different from Linda's (A), and since humans have two alleles for each gene and Bob carries one normal and one disease-causing allele, it means he has two different versions of the CFTR gene (B).

Bob and Linda Are a Newly Married Couple