Question

In shorthorn cattle, genes for red (R) and white (r) coat colour occur. Cross between red (RR) and white (rr) produces roan (Rr). This is an example of

• A. incomplete dominance
• B. codominance
• C. complementary genes
• D. epistasis

Answer 1

The correct option is B codominance

Codominance is the phenomenon in which both the characters from both parents are expressed in the progeny. Example: ABO blood type, roan colour in cattle etc.

In roan colour of cattle, both red and white coat colour from parents appear. Neither the red nor the white coat colour is dominant or recessive. Both are expressed at the same time in the progeny.