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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

1. segregation in the expected 9 : 3 : 3 : 1 ratio
2. segregation in 3 : 1 ratio
3. higher number of the parental types
4. higher number of the recombinant types

Correct answer: higher number of the parental types

Solution

Because R and Y are very close on the same chromosome, they are tightly linked and rarely separated by crossing over. As a result, the parental allele combinations appear more often than recombinant combinations in the F2.

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