TABLE 2

Fitness of Sxl^F mutants capable of splicing tra^S

	Genotype		Fitness
Sex	tra	dsx	Male	Female	Comments
Female	Sxl⁺/Sxl⁺	tra⁺/tra^S		1	Original female
Male		tra^S/tra^S	1		Original male
Female	Sxl⁺/Sxl^F	tra⁺/tra^S		1 + g	More TRA, better female
Female		tra^S/tra^S		1 + g2	More TRA, better female