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World 2 · Dihybrid & Probability · 7 min · PRO

Two traits at once

The dihybrid cross

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.

  • Independent assortment
  • The 9:3:3:1 ratio
  • The product rule
  • The sum rule
  • The test cross
PRO includes
  • All 26 labs — every world, every lesson
  • Practice exams and certificates

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Unlock GeneticsTry the free world
← World 1 lab challengeIndependent assortment →

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