NEET 2004 Biology question

Crossing over that results in genetic recombination in higher organisms occurs between :-

(1)Non-sister chromatids of a bivalentCorrect
(2)Two daughter nuclei
(3)Two different bivalents
(4)Sister chromatids of a bivalent

Answer: (1)

Solution

Crossing over takes place during pachytene of meiotic prophase I, when homologous chromosomes are paired as a bivalent (tetrad); exchange of segments occurs between non-sister chromatids of the two homologues, producing new

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Question ID VK-089463