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Recombination occurs in _________

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in Cytogenetics by (679k points)
Recombination occurs in _________

(a) Single strand stage

(b) Two strand stage

(c) Three strand stage

(d) Four stand stage

The question was asked in exam.

My question is based upon Linkage and Crossing Over in portion Genetic Recombination of Cytogenetics

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The correct choice is (d) Four stand stage

To explain I would say: The only possibilities in this case are recombination in 2 strands and 4 strand stage. The study of recombinants show that recombination at 2 stand stage will produce effectively the same combination as in the absence of recombination. Thus it must be in the 4 strand stage.

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