AP BIOLOGY

Detailed explanation-1: -Curly hair is considered a “dominant” gene trait. Straight hair is considered “recessive.” To put that in simple terms, that means that if one parent gives you a curly-haired gene and the other parent gives you a straight-haired gene, you’ll be born with curly hair.

Detailed explanation-2: -We can call the straight hair allele “S” and the curly hair allele “C.” Everyone has two copies of the hair texture gene. Their genotype will determine what kind of hair they have.

Detailed explanation-3: -Dominant and recessive genes. The most common interaction between alleles is a dominant/recessive relationship. An allele of a gene is said to be dominant when it effectively overrules the other (recessive) allele. Eye colour and blood groups are both examples of dominant/recessive gene relationships.

Detailed explanation-4: -Wavy hair is an intermediate phenotype between straight and curly hair. The presence of an intermediate phenotype means that it is an example of incomplete dominance.