The phenotypic ratio is 9:3:3:1.

Quick Scoop

In a classic Mendelian dihybrid cross where both parents are heterozygous for both traits (for example, AaBb × AaBb), the offspring show a 9:3:3:1 phenotypic ratio, assuming independent assortment and complete dominance.

  • 9/16 show both dominant traits.
  • 3/16 show dominant for the first trait, recessive for the second.
  • 3/16 show recessive for the first trait, dominant for the second.
  • 1/16 show both recessive traits.

So, if your multiple-choice options include 9:3:3:1, that’s the one to pick. ✅

TL;DR: In any dihybrid cross with both parents heterozygous for both traits, the offspring phenotypic ratio is 9:3:3:1.

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