TABLE 1.

Classification of the 40 wild-type chromosomes in this experiment and the 12 in Fowleret al. (1997)

	TM2 never seen	TM2 transient	TM2 invaded	Total
+/+ viable	0	6	4	10
+/+ lethal	5	10	15	30
Fowler et al. (1997)	0	1	11	12