AP BIOLOGY

Detailed explanation-1: -Recessive alleles only show their effect if the individual has two copies of the allele (also known as being homozygous?). For example, the allele for blue eyes is recessive, therefore to have blue eyes you need to have two copies of the ‘blue eye’ allele.

Detailed explanation-2: -Definition. A type of allele that when present on its own will not affect the individual. Two copies of the allele need to be present for the phenotype to be expressed.

Detailed explanation-3: -Examples of Recessive Traits Cleft chin, dimples, and freckles are similar examples; individuals with recessive alleles for a cleft chin, dimples, or freckles do not have these traits. Having round (as opposed to almond-shaped) eyes is recessive, along with inability to roll one’s tongue.

Detailed explanation-4: -The dominant purple and recessive white alleles are responsible for flower color in pea plants. Black, blue, green, and brown eye color alleles. Black, brown, blonde hair color alleles.