Question

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 F${}_2$ segregation will show

• A. Higher number of the recombinant types
• B. Segregation in the expected 9 : 3 : 3: 1 ratio
• C. Segregation in 3: 1 ratio
• D. Higher number of the parental types

Answer 1

The correct option is D Higher number of the parental types

When two genes are closely located on same chromosome there are more chances of the genes to undergo linkage. They will thus inherit together. It will result in increase in the number of parental types in F${}_2$ generation. Thus, the segregation shows more RRYY and rryy genotypes.