NEET 2007 Biology 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 segregation will show:

(1)Higher number of the parental types.Correct
(2)Higher number of the recombinant types.
(3)Segregation in the expected 9: 3: 3: 1 ratio.
(4)Segregation in 3:1 ratio.

Answer: (1)

Solution

When two genes lie very close on the same chromosome they are tightly linked; crossing over between them is rare, so the F (RrYy) produces mostly parental gametes (RY and ry) and very few recombinant gametes (Ry and rY). In the F the parental phenotypes (dominant for

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Question ID VK-089816