Assertion : Variety of fruit colours in Cucurbita pepo is result of recessive epistasis
Reason : In recessive epistatsis, a recessive gene at one locus engances the expression of another gene, at a diferent locus.

Answer

D

Explanation

Fruit colour of summer squash (Cucurbita pepo) is governed by a gene which produced yellow colour in dominant state (Y) and green colour in recessive state (yy). There is a non-pigment forming epistatic gene which in dominant state (W-) produces white colour (W-Y-,W-yy) while in recessive state it allows the yellow (wwY-) and green (wwyy) expression. This shows dominant epistasis where a dominant epistatic allele suppresses the expression of a non allelic gene whether the latter is dominant or recessive