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A Particular Cross Gives a Modified Dihybrid Ratio of 9:7

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A particular cross gives a modified dihybrid ratio of 9:7.What phenotypic ratio would you expect in a testcross of the fully heterozygous F₁ crossed with the fully recessive type? Diagram the testcross using A,a,B,b as symbol sets.

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1:3 AaBb ×...

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