Question

What is true about incomplete dominance?

A. Genotype can be determined directly from phenotype
B. One gene affects the expression of another
C. All progeny of a given cross are heterozygotes
D. Two genes do not assort independently
E. Progeny never have the same phenotype as either parent

Also please explain why the other answers are incorrect, thanks.

Answer 1

In incomplete dominance, the dominant allele can not mask the the recessive allele copletely. As a result the resultant offspring will carry a mixture of phenotype of both dominant and recessive allele.

A. Genotype can be determined directly from phenotype

as the phenotype is a combination of both the parents phenotype, genotype will also be a mixed allele of dominant and recessive one.

C. All progeny of a given cross are heterozygotes

the genotype is a combination of dominant and recessive allele.

E. Progeny never have the same phenotype as either parent

the phenotype is always a mixed phenotype of both parents.

B. One gene affects the expression of another

as here both the dominant and recessive allele can not dominate one another.

D. Two genes do not assort independently

this is not true.