A scientist has a tomato plant with red-skinned tomatoes. It has one allele for red skin (R) and one for yellow skin (r).Which describes the phenotype of the tomato plant?

The genotype is Rr, with one allele for red skin and one for yellow skin. Since the plant’s tomatoes are described as red-skinned, its phenotype—the observable trait—is red skin. Heterozygous describes the genotype, not the phenotype.

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