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

User Harolyn
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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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User Darren Gansberg
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