Question

if sophie conceives a child, and the father neither has cystic fibrosis nor is a carrier, what are the chances that the child would have cystic fibrosis? 0%, because the child must receive the bad gene from both parents 75%, because sophie has the condition but the father does not 50%, because there is a 50% chance that sophie will pass along the bad gene 100%, because sophie has the condition 25%, because only one in four gametes will carry the bad gene

Explanation:

Cystic fibrosis is an autosomal - recessive disorder. A child needs to inherit two copies of the mutated gene (one from each parent) to have the disease. Since the father neither has the disease nor is a carrier (has no mutated allele), the child cannot receive two mutated alleles.

Answer:

0%, because the child must receive the bad gene from both parents