Question

In short horn cattle, genes for red (r1) and white (r2) coat colour occur. Crosses between red (r1r1) and white (r2r2) produced (r1r2) roan. This is an example of

• A. Complementary genes
• B. Epistasis
• C. Codominance
• D. Incomplete dominance

Answer 1

Answer: (C)

Codominance

Here, both type of traits are transmitting in a single individual. It means both are dominant at a time or codominant, e.g., blood groups of human being and roan colour in cattles.

Codominance is a condition in which two different alleles for a genetic trait, both are expressed. Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent.