Rapid Evolution of Assortative Fertilization between Recently Allopatric Species of Drosophila

Table 1

Progeny numbers and egg hatch rate for crosses within and between D. americana (NN97.4-red) and D. novamexicana (1031.4).

Female parent	Number of progeny (±S.E)		Egg hatch rate (±S.E.)
	Conspecific	Heterospecific	Conspecific	Heterospecific
D. americana	73.5 (±0.87)	23.4 (±0.33)	0.90 (±0.009)	0.36 (±0.03)
D. novamexicana	69.2 (±0.44)	1.4 (±0.08)	0.97 (±0.009)	0.008 (±0.003)