In drosophila the recessive autosomal bw causes brown eyes by blocking synthesis

Question

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

Explanation / Answer

9:3:3:1

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