Question

A gene showing codominance has

• A. alleles that are recessive
• B. one allele dominant on the other
• C. both alleles independently expressed in the heterozygote
• D. alleles tightly linked on the same chromosome

Answer 1

The correct option is C both alleles independently expressed in the heterozygote

When both the alleles are independently and equally expressed in heterozygous form, it is known as codominance. Here, both alleles express themself and their products can be phenotypically derived. Examples of codominance are the blood group AB, MN types.
Alleles that are recessive express themselves only in homozygous conditions. While allele that is dominant on other express them-self either in homozygous or in heterozygous condition.
Alleles tightly linked on the same chromosome show linkage.