AP BIOLOGY

Detailed explanation-1: -An individual with one dominant and one recessive allele for a gene will have the dominant phenotype. They are generally considered “carriers” of the recessive allele: the recessive allele is there, but the recessive phenotype is not.

Detailed explanation-2: -Recessive alleles are only expressed if both of a person’s alleles are recessive. If a person has one dominant allele and one recessive, he is called a carrier.

Detailed explanation-3: -A carrier is a person who can pass an inherited (genetic) disease on to their children but who does not have the disease. The person can also pass on carrier status. Some diseases are caused by changes in a person’s chromosomes or genes.

Detailed explanation-4: -The parents of a child with an autosomal recessive condition usually do not have the condition. Unaffected parents are called carriers because they each carry one copy of the mutated gene and can pass it to their children.