Question

A gene showing incomplete dominance has:

• A. one allele dominant over the other
• B. both alleles of the gene present on the same chromosome
• C. both alleles independently expressed in the heterozygote
• D. both alleles expressed partially in the heterozygote

Answer 1

The correct option is D both alleles expressed partially in the heterozygote

When the two alternate forms of a gene do not completely mask the effects of either one, and the hybrid organism's resulting physical appearance shows a blending of both alleles, then the condition is known as incomplete dominance.

For example, in snapdragon, the cross between red and white-flowered plants produces pink-flowered plants.

If one allele is dominant over the other then it is obeying the law of dominance of Mendel.

Both alleles of a gene cannot be present on the same chromosome, rather they are present on a homologous pair of chromosomes.

In the case of co-dominance, both alleles are expressed independently in the heterozygote.