Q. Two genes R and Y are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, then $F_{2}$-segregation wii show
A) 1 : 2 : 1
B) 3 : 1
C) 9 : 3 : 3 : 1
D) 1 : 1 : 1
Explanation
The genotypic ratio of monohybrid cross is 1 : 2 : 1, whereas the phenotypic ratio is 3 : 1. 9 : 3 : 3 : 1 is the phenotypic ratio of dihybrid cross (the cross made to study the inheritance of two pairs of factors or alleles of two genes).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.