Question

Which of the statements about incomplete dominance are true?

1) Heterozygous individuals have the same phenotype as homozygous dominant individuals.

2) Heterozygous individuals have a phenotype intermediate to the homozygous dominant and homozygous recessive phenotypes.

3) Heterozygous individuals express both the homozygous dominant and homozygous recessive phenotypes.

4) If homozygous dominant mice have black fur, and homozygous recessive mice have white fur, then heterozygous mice have gray fur.

Answer 1

The statement 1 is not true.

Reason:- when heterozygous individual have the same phenotype as homozygous dominant individual it is the case of complete dominance and not incomplete dominance

The statement 2 is true.

In incomplete dominance heterozygous individual have a phenotype intermediate to the homozygous dominant and homozygous recessive phenotype . In this one allele is not completely dominant over the other allele.

The statement 3 is also false.

Reason:- when heterozygous individual express both the homozygous dominant and homozygous recessive phenotype it is the case of co- dominance.

The statement 4 is true.

It is an example of incomplete dominance in which if a homozygous dominant mice have black fur and homozygous recessive mice have white fur then heterozygous mice will have gray fur.