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CAIE A-Level Biology 16.2.2 Genetic Diagrams and Punnett Squares

Practise building genetic diagrams with parental genotypes, gametes and offspring, then use phenotype ratios or test crosses to identify inheritance patterns.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • construct crosses with parental genotypes, gametes, offspring and phenotype ratios
  • use offspring data to distinguish dominance, sex linkage, autosomal linkage and epistasis
  • explain a test cross by pairing a dominant phenotype with a homozygous recessive

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