Abstract
Comparative studies on male and female meiosis in diploid (2 n = 2x = 14) and colchitetraploid (2 n = 4x = 28) ornamental Phlox drummondiireveal higher chiasma frequency in embryo-sac mother cells as compared with pollen mother cells in the diploid, and significant differences in the pairing properties of chromosomes in the pollen mother cells and embryo-sac mother cells of the colchitetraploid. Male meiosis in the colchicine-induced autotetraploid was abnormal with 51·70% of chromosomes associated in quadrivalents and trivalents in 96% of the cells. This was followed by discordant anaphase I disjunction. In the female meiocytes the chromosomes formed 14 bivalents in 86·66% of the cells. Quadrivalents (1–3) appeared only in 13·34% of the cells. It is concluded that meiosis in male and female cells of the colchitetraploid is governed and regulated by different controlling systems of gene(s).
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