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Tomato flesh is typically red due to the production of lycopene, which is a carotenoidpigment....

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Biology

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Tomato flesh is typically red due to the production of lycopene, which is a carotenoidpigment. Some tomatoes may have tangerine-colored flesh or yellow-colored flesh.In the 1950's, researchers reported that this variation in tomato flesh color could beexplained by an epistatic interaction involving genes T and R. Previous work hadshown that red flesh is the wild-type phenotype, and that yellow flesh is caused by arecessive mutation at the R locus only. The researchers were not sure, however, howtangerine flesh was inherited. They established a cross between two doubleheterozygous red-fleshed tomatoes and observed the following offspring: 27 red-fleshed plants, 12 tangerine-fleshed plants, and 9 yellow-fleshed plants. Use thisinformation to answer the following questions.(a) In general, what must the genotypes be for red-fleshed tomatoes, tangerine-fleshedtomatoes, and yellow-fleshed tomatoes, respectively?(b) You cross a heterozygous red-fleshed plant with a true-breeding yellow-fleshedplant. What are the genotypes of these two plants? What are the expected offspringphenotypes, and in what proportions? Use a punnett square or product law / forkedline method to support your answer.

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