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| Modern Genetic Analysis Chapter 6. Gene Interaction The colors of peppers are determined by the interaction of several genes. An allele Y promotes early elimination of chlorophyll, whereas y does not. R determines red and r yellow carotenoid pigments. Alleles c1 and c2 of two different genes down-regulate the amounts of carotenoids causing the lighter shades. Orange is down-regulated red. Brown is green plus red. Pale yellow is down-regulated yellow.(Anthony Griffiths)

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