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Abstract
The effect of environment on pairing of chromosomes, chiasma frequency and chromosome associations at diakinesis and metaphase I was studied in a desynaptic double trisomic pearl millet. It was observed that during the periods when the day temperatures were low there was enhanced formation of trivalents and ring bivalents with concommitant increase in chiasma frequency. There was reduction in the frequency of chiasmata, trivalents and ring bivalents in the material analysed druring high temperature conditions. The difference in the expression of desynapsis in double trisomic during the period of analysis can be ascribed to the varying environmental conditions.
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