Question

Which statement about cystic fibrosis is true?
O who do not have the cystic fibrosis mutation.
Cystic fibrosis is
• caused by a deletion
of one codon in the
DNA molecule.
Cystic fibrosis is caused by a mutation
• in which a dominant allele replaces a recessive allele.
Cystic fibrosis affects a person's ability to make normal red blood cells.

Answer 1

Cystic fibrosis is caused by a mutation in which a dominant allele replaces a recessive allele.