Question

Onion bulb shows white colouration instead of red-yellow pigmentation when allele of another gene I is present. It is an example of ______________.

• A. Recessive epistasis
• B. Dominant epistasis
• C. Dominant-recessive epistasis
• D. Collaborative supplementary gene.

Answer 1

The correct option is A Recessive epistasis

In Onion, the gene for red-yellow colour in homozygous state, is epistatic to gene for white colour. So, red-yellow gene mask white gene. White colour is dominant and red-yellow colour is recessive. So, it is a recessive epistasis.

So, the correct option is ‘Recessive epistasis’.