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Is two crossovers occur between same two strands, this will result in__________

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Is two crossovers occur between same two strands, this will result in__________

(a) All recombinant strands

(b) Three recombinant strands with different loci exchanged

(c) Exchange of middle portion between two strands

(d) Exchange of ends

This question was posed to me in an interview.

Asked question is from Linkage and Crossing Over topic in chapter Genetic Recombination of Cytogenetics

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Right choice is (c) Exchange of middle portion between two strands

To explain: Double cross over event occurring between two strands only result in the production of two strands that exchanged a portion between them in the middle. The other two strands remain unaffected.

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