Abstract

Plants with two extra chromosomes were obtained in the progeny of a triploid plant. The extra chromosomes were deficient for short segments in one of their arms. Meiotic studies in PMC's of these plants showed that these extra chromosomes were not pairing with any of the other chromosomes of the complement but were only pairing among themselves. In cells with the extra chromosomes there was a significant variation in PMC' chiasma frequency. Meiotic abnormalities like differential condensation of chromosomes, persistent nucleoli and cytomixis were observed. The effect of these extra chromosomes on the behaviour of the other chromosomes was compared with the effect of B's when present in numbers of five or more on the A-chromosomes.

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