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(a) X - centromere
Y - Chiasmata
(b) X - It joins / hold sister chromatids together/
It is a point of attachment for the spindle fibres ;
Y - (Non-sister chromatids) crossover and exchange genes ; (leading to genetic variationor recombination ;)
sharon kalunda answered the question on May 24, 2019 at 10:01
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