A   wild-type   (most   common
   phenotype) red-eyed female is mated with a mutant white-eyed male.
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   The F[1] offspring all had red eyes.
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   The  F[2]  showed a typical Mendelian 3:1 phenotype ratio of red:white
   eyes.
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   However, all females had red eyes. The males exhibited a 1:1 phenotype
   ratio.
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   conclusion