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Dyad formation in plants of Group 3. (a) Dyads amid tetrads; (b) abnormal pollen grain development; meiocytes at the leptotene stage amid pollen grains (shown with an arrow); (c) The frequency of dyad formation inversely correlates (r = −0.73) with seed set. r—correlation coefficient. Staining acetocarmine. Scale bar = 10 μm.
