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      Question

      In a dihybrid cross involving two heterozygous parents

      (AaBb × AaBb), what is the expected phenotypic ratio, assuming independent assortment and complete dominance?
      A 3:1 Correct Answer Incorrect Answer
      B 9:3:3:1 Correct Answer Incorrect Answer
      C 1:1:1:1 Correct Answer Incorrect Answer
      D 1:2:1 Correct Answer Incorrect Answer
      E 9:6:1 Correct Answer Incorrect Answer

      Solution

      In a dihybrid cross (AaBb × AaBb), using Mendel’s law of independent assortment, the phenotypic ratio follows 9:3:3:1, where: 9 = dominant for both traits 3 = dominant for A, recessive for B 3 = recessive for A, dominant for B 1 = recessive for both traits

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