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CAIE A-Level Biology 16.2 Genes and Phenotype Question Bank

Practise genes-and-phenotype questions by building genetic diagrams, testing expected ratios and tracing how alleles change proteins, traits or disease outcomes.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • construct genetic diagrams for dominance, codominance, sex linkage, epistasis or test crosses
  • calculate chi-squared from observed and expected ratios, then judge significance
  • link alleles to altered proteins and phenotypes such as TYR, HBB, HTT or Le/le

Covered syllabus points

16.2.1—Core genetic terms16.2.2—Genetic diagrams16.2.3—Chi-squared test in genetics16.2.4—Genes, proteins and phenotype16.2.5—Gibberellin role in stem elongation

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