In drosophila the recessive autosomal bw causes brown eyes by blocking synthesis of the red pterin pigments and the recessive sex-linked ve causes bright red (vermillion) eyes by blocking synthesis of the brown xanthommatin pigment. Double mutant flies have white eyes, while wild type eyes are dark red color.

-If a white-eyed females from a pure breeding stock carrying these mutations is mated with a wild type male, what will be the phenotype of the F1 males and females? What will be the phenotypic proportions among an F2 obtained by crossing these F1s among themselves.