Why is the frequency of recombinant gametes always half the frequency of crossing over?

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asked Mar 10, 2019 38.5k views

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Darren Gansberg · Answer 1 · 2019-03-13T17:11:28+0000

Crossing over occurs at the four-strand stage when two homologous chromosomes, each consisting of a pair of sister chromatids, are paired. Each crossover involves just two of the four strands and generates two recombinant strands.

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Why is the frequency of recombinant gametes always half the frequency of crossing over?

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