A fruit fly has black eyes. Having red eyes is a dominant trait (R) and having black eyes is a recessive trait (r).Which describes the fruit fly’s genotype and phenotype?

A black-eyed fruit fly shows the recessive trait, so it must have two recessive alleles: rr. The genotype is the allele combination (rr), while the phenotype is the observable trait (black eyes). Therefore, the correct choice is “genotype: rr; phenotype: black eyes.”

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