Abstract
Cytological effects of some (Pb, Cu, Zn, Hg) heavy metals were tested on meiotic studies of Helianthus annuus. The used heavy metals did not show much variations in the type of induced abnormal PMCs. The abundant meiotic irregularities stickiness, lagging, bridges, unequal separation, fragmentation etc. were observed. Mercury was the most toxic of all used heavy metals since it produced highest percentage of abnormal PMCs. Lead nitrate is a mutagen which induce tetraploidy.
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