Question

An individual with (naturally) curly hair and an individual with (naturally) straight hair mate; all of their offspring have (naturally) wavy hair. What is the relationship between the alleles for hair texture?

A) pleiotropy
B) incomplete dominance
C) wavy hair dominant to both straight and curly hair
D) codominance

Answer 1

Incomplete dominance

Step-by-step explanation:

In incomplete dominance when two alleles of same genes come together in the offspring than the no allele is able to show dominance over the other allele so the phenotypic character of offspring is different from parent's phenotype and an intermediate phenotype is formed.

So here when two different alleles of parents when comes together in offspring give rise to an intermediate phenotype that has naturally wavy hair rather than naturally curly hair or naturally straight hair. This shows that when alleles from both parents come together they show incomplete dominance over the other allele. So the right answer is B.