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Question

The expected phenotypic ratio of a dihybrid cross is:

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Explanation

Mendelian dihybrid cross between heterozygotes AaBb x AaBb yields independent assortment of two unlinked genes. Phenotypic classes appear as 9 dominant for both traits, 3 dominant first recessive second, 3 recessive first dominant second, and 1 recessive for both traits overall.

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