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  4. Which event involves in crossing over?

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Q. Which event involves in crossing over?

AMUAMU 2001

Solution:

Crossing over is an essential element of meiosis occurring during prophase, when non-sister chromatids of homologous chromosomes exchange portion of DNA strands.
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Chromosomes become thick and short during prophase and formation of mitotic spindle takes place.
Pairing of chromosome occurs in prophase-I of meiosis-I. With the genes of the chromosomes thus aligned, a DNA strand of one homologous can pair with the complementary DNA stand of the other. The process of pairing is called synapse.