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A Strain of a Cereal Grain Can Be Either Dark

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A strain of a cereal grain can be either dark tan,medium-dark tan,medium tan,light tan,or cream colored.When a dark tan and a cream plant are crossed,all F₁ are medium tan.The F₂ are distributed in a ratio of 1:4:6:4:1 from darkest to lightest.How many additive alleles are needed to produce the darkest phenotypes?

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