Q. A true breeding plant producing red flowers is crossed with a pure plant producing white flowers. Allele for red colour of flower is dominant. After selfing the plants of first filial generation, the proportion of plants producing white flowers in the progeny would be

A) 9 : 3 : 3 : 1
B) 12 : 3 : 1
C) 9 : 3 : 4
D) 9 : 6 : 1
Explanation

In dominant epistasis, a dominant gene(epistatic) masks the expression of another dominant or recessive gene (hypostatic). Such interactions give the modified F2 ratio as 12 : 3 : 1.

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.