Microscopic study of onion (Allium cepa) root tips treated with 0%, 0.001%, 0.01%, 0.1% and 1% concentration of four food colour additive for 36 h (a). Abnormal prophase, (b). Sticky metaphase, (c). Dislocated metaphase, (d). C-Mitosis, (e). Forwarded anaphase, (f). Sticky anaphase, (g). Bridge anaphase and (h). Laggard anaphase. Scale bars=5 µm cellˉ¹.