Figure 2.

Females expressing the experimental, synthetic Y chromosomes have retarded development, but no other reductions in fitness. (a) The fraction of females emerging vs. time since eggs were laid, for females expressing a synthetic Y from experimental EA (N_{G = 29} = 107, N_{G = 30} = 143) and EB (N_{G = 29} = 130, N_{G = 30} = 153), or control CA′ (N_{G = 29} = 114, N_{G = 30} = 141) and CB′ (N_{G = 29} = 126, N_{G = 30} = 148) males. The fraction of females emerging by day 10 is significantly lower in the experimental lines (P_{G = 29} = 0.0163, P_{G = 30} = 0.0161, directed Student’s t tests, df = 2). (b) The total number of adult offspring (measures net female fitness independent of development time) produced by EAB or CAB females (red-eyed offspring) in competition with tester-females (pink-eyed offspring). There is no significant difference between lines (P = 0.625, directed χ² contingency test).