AP BIOLOGY

Detailed explanation-1: -Cystic fibrosis (CF) is a genetic disease. This means that it is inherited. A child will be born with CF only if they inherit one CF gene from each parent. A person who has only one CF gene is called a CF carrier.

Detailed explanation-2: -Cystic fibrosis is inherited. This means it is passed down from parent to child through the genes. Your baby inherited a normal CF gene (N) from one parent, and a mutation of a CF gene (C) from the other parent. This means at least one parent (mother or father) is also a CF carrier.

Detailed explanation-3: -Cystic fibrosis is an example of a recessive disease. That means a person must have a mutation in both copies of the CFTR gene to have CF. If someone has a mutation in only one copy of the CFTR gene and the other copy is normal, he or she does not have CF and is a CF carrier.

Detailed explanation-4: -A person must inherit two CF genes to have CF disease. When your child was conceived, * he or she received a CF gene from both you and your partner. A child can inherit CF only if both parents carry a CF gene (that is, each parent either has CF or is a carrier*) and both parents pass the CF gene on to their child.

Detailed explanation-5: -To be born with cystic fibrosis, a child has to inherit a copy of the faulty gene from both of their parents. This can happen if the parents are “carriers” of the faulty gene, which means they don’t have cystic fibrosis themselves.