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World 2 · Dihybrid & Probability · 8 min · PRO

The 9:3:3:1 ratio

Reading the dihybrid grid

PRO · Genetics

World 2: Dihybrid & Probability is part of PRO

The first world of Genetics is free. PRO opens the other 44 lessons in 7 worlds — simulations, quizzes and all.

  • Two traits at once
  • Independent assortment
  • The product rule
  • The sum rule
  • The test cross
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