Question

​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?

Answer 1

1 curly hair : 1 wavy hair

Step-by-step explanation:

​In humans, hair texture is an incompletely dominant trait (the phenotype determined by the heterozygous genotype is a mixture between the homozygous dominant and homozygous recessive traits).

• CC determines curly hair
• Cc determines wavy hair
• cc determines straight hair

A cross occurs between a man with wavy hair (Cc) and a woman with curly hair (CC).

The man can produce C and c gametes. The woman can only produce C gametes.

Their possible children would be:

• 1/2 CC - curly hair
• 1/2 Cc - wavy hair