TABLE 5:

Summary of the effect of varying powers in the trap on chromosome movement when applied to the kinetochore of anaphase chromosomes or cut prometaphase bivalents in crane-fly spermatocytes.

	Cut prometaphase bivalent or anaphase chromosome movement
Power at the objective (26% of power at back focal plane) (mW)	Stops movement and recovers	Stops movement and no Recovery	Decrease in velocity	No effect	Total	Percentage of stopped KT movement (%)	Percentage of decreased velocity (%)	Stopped movement or decreased velocity (%)
25–55	8 (50%)	0	3 (19%)	5 (31%)	16	50	19	69
56–85	9 (69%)	1 (8%)	2 (15%)	1 (8%)	13	77	15	92
86–140	3 (43%)	1 (14%)	2 (29%)	1 (14%)	7	57	29	86
Total	20 (56%)	2 (6%)	7 (19%)	7 (19%)	36