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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 F2 segregation will show

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

The correct option is A Higher number of the parental types
When the linked genes are situated quite close, the chances of crossing over are highly reduced. Due to this, a large number of parental gametes are formed and only a few recombinant gametes are formed. This results in higher number of parental types in an F2 generation as compared to recombinants.

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