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The chiasma is first formed and then at that point crossing over takes place.

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The chiasma is first formed and then at that point crossing over takes place.

(a) True

(b) False

The question was asked in an interview for internship.

The above asked question is from Meiosis Prophase 1 : Pachytene in division Chromosomal Changes During Meiosis of Cytogenetics

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Right answer is (b) False

To explain: The crossing over takes place at pachytene stage while the chiasma forms later. The chiasma is physical manifestation of the point of crossing over so it occurs after crossing over is complete.

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