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Punnett square percentages

Year 12 maths · Fieldbook Learning

Name ______________________ Date __________

Draw the 2 × 2 square: each box is 25%.

  1. In a cross AA × aa, "a" is a recessive allele. What percentage of the offspring are expected to show the recessive trait (aa)?
  2. In a cross Aa × Aa, "a" is a recessive allele. What percentage of the offspring are expected to show the recessive trait (aa)?
  3. In a cross AA × Aa, "a" is a recessive allele. What percentage of the offspring are expected to show the recessive trait (aa)?
  4. In a cross Aa × aa, "a" is a recessive allele. What percentage of the offspring are expected to show the recessive trait (aa)?
  5. In a cross aa × aa, "a" is a recessive allele. What percentage of the offspring are expected to show the recessive trait (aa)?
More free practice: fieldbooklearning.com/uk/practice/year-12/punnett-square-percentages/

Answer key: Punnett square percentages

  1. 0%
  2. 25%
  3. 0%
  4. 50%
  5. 100%