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, the F2 segregation will show
A) segregation in the expected 9 : 3 : 3 : 1 ratio
B) segregation in 3 : 1 ratio
C) higher number of the parental types
D) higher number of the recombinant types
Explanation
[Solution from source] Genes lying very close together are tightly linked and rarely separated by crossing over, so the F2 shows many more parental combinations than recombinants. The 9:3:3:1 ratio holds only for independently assorting genes. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.