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Crossing over...

Crossing over

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Exchange of genes between non-sister chromatids of homologous chromosome during pachytene of meiosis-I
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Assertion :- During pachytene crossing over takes place which is dependent on recombinase Reason:- Recombinase is the group of enzymes involved in crossing over and crossing over is an enzyme dependent process.

Cross over frequency is proportional to

Assertion : Somatic or mitotic cross over is never reported by any scientist. Reason: The meiotic cross over produces patches of cross over tissue between the normal cells.

In tetrad, the number of non cross over chromatids is normally :–