AP BIOLOGY

Detailed explanation-1: -Only individuals with an aa genotype will express a recessive trait; therefore, offspring must receive one recessive allele from each parent to exhibit a recessive trait.

Detailed explanation-2: -A dominant allele is denoted by a capital letter (A versus a). Since each parent provides one allele, the possible combinations are: AA, Aa, and aa. Offspring whose genotype is either AA or Aa will have the dominant trait expressed phenotypically, while aa individuals express the recessive trait.

Detailed explanation-3: -The genotype aa would result in an individual with the recessive phenotype. aa is a homozygous genotype that consists of two recessive alleles. There is no dominant allele present in this genotype to overrule the effect of recessive alleles. Aa is a heterozygous genotype.

Detailed explanation-4: -Aa-heterozygous dominant (individual has both dominant and recessive gene, but only one is expressed) Was this answer helpful?

Detailed explanation-5: -A disease trait that is inherited in an autosomal dominant manner can occur in either sex and can be transmitted by either parent. It manifests itself in the heterozygote (designated Aa), who receives a mutant gene (designated a) from one parent and a normal (“wild-type”) gene (designated A) from the other.