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| Modern Genetic Analysis Chapter 6. Gene Interaction Penetrance and Expressivity Figure 6-18. Diagram representing the effects of penetrance and expressivity through a hypothetical character "pigment intensity." In each row, all individuals have the same allele, say P, giving them the same "potential to produce pigment." However, effects deriving from the rest of the genome and from the environment may suppress or modify pigment production in an individual.

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