All the ten taxa studied revealed a regular course of meiosis. The twentyfour hybrid. produced fell into six groups depending upon the nature of meiosis and the extent of pollen fertility in them, irregularities in the form of non-orientation of bivalents on metaphase plates, anaphase bridges, laggards and unequal distribution of chromosomes at anaphase I were observed in the hybrids. The six amphidiploids produced by colchicine treatment from the hybrids representing all the six groups led to the conclusion that sterility observed in respective hybrids was mainly due to cryptic and gross structural differences of which the former appeared to be more predominant.
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