Hair texture in humans is an example of incomplete dominance. If a man with curly hair has children with a woman with straight hair, all the children has an intermediate texture that is wavy hair. What is the likely proportion of phenotypes in their children?

The gene involved here codes for hair texture in humans. The alleles of the gene (straight, S and curly, s) exhibits incomplete dominance. Incomplete dominance is a genetic scenario whereby one allele does not completely mask the expression of the other allele, instead an intermediate phenotype that is heterozygous is formed.

In this case, a man with curly hair (ss) marries a woman with straight hair (SS). The children from this cross will all possess a heterozygous genotype (Ss) and be phenotypically wavy-haired, since Incomplete dominance is exhibited by the gene. Therefore, 100% of the offsprings/children will have wavy hair phenotype.

Oseni Oseni · Answer 2 · 2020-04-19T04:32:02+02:00

Answer:

100% wavy haired

Explanation:

Let the allele for curly hair texture be represented by C and the allele for for straight hair texture be c.

A man with curly hair will have the genotype CC.

A woman with straight hair will have the genotype cc.

Crossing the two in marriage:

CC x cc

Progeny: Cc, Cc, Cc and Cc.

Recall that the hair texture gene exhibit incomplete dominance, meaning that heterozygous individuals have intermediate attribute - wavy hair.

Hence, all the children will have wavy hair.