Q. Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?
A) Phenotypic ratio - 1 : 2 : 1
B) Phenotypic ratio - 3 : 1
C) Phenotypic ratio - 9 : 3 : 3 : 1
D) Phenotypic ratio - 9 : 7
Explanation
[Solution by Claude - not from source] RRYY $\times$ rryy gives RrYy in $F_1$; selfing gives the dihybrid phenotypic ratio 9:3:3:1. Answer (3), as in the answer key.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.