In humans,hair texture is an incompletely dominant trait.Curly is the dominant genotype,wavy is heterozygous,and straight hair is recessive.What is the probable phenotypic ratio for a cross between a man with wavy hair and a woman with curly hair?
A) All wavy hair
B) 3/4 wavy hair; 1/4 straight hair
C) 1/2 wavy hair; 1/2 curly hair
D) All curly hair
E) 1/4 curly hair; 1/2 wavy hair; 1/4 straight hair

Question

Quizplus · Accepted Answer

Given the information, the man with wavy hair has a heterozygous genotype (Cw, where C = curly and w = straight), and the woman with curly hair has either a homozygous dominant (CC) or heterozygous (Cw) genotype. Since curly is dominant and wavy is the result of heterozygosity, the cross will produce offspring with either curly or wavy hair, depending on whether the woman is CC or Cw. The most probable scenario, without knowing if the woman is homozygous or heterozygous, is a 1:1 ratio of wavy to curly hair, as at least one parent contributes a dominant allele (C) and the other can contribute either a dominant (C) or recessive (w) allele.

In Humans,hair Texture Is an Incompletely Dominant Trait