If my F1 generation was only supposed to produce flies with red eyes, why were white eyes also produced in the F1 generation? SET I (A): EYE COLOR BwBw - red eye (normal) StSt - red eye (normal) bwbw - brown eye stst - scarlet, bright orange tint P 1 : BwBw, StSt males X bwbw, stst females F 1 expected ratio 1 : 1 Bwbw , Stst.