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IB Biology HL D4.1.13 Hl Hardy Weinberg Equation Questions

Work through equilibrium-population calculations with p + q = 1, p² + 2pq + q² = 1, and phenotype-frequency data.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • State and use p + q = 1 and p² + 2pq + q² = 1 to derive expected genotype frequencies in an equilibrium population.
  • Calculate expected genotype or phenotype frequencies and population counts from allele frequencies using q², p² and 2pq.

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Study D4.1.13 (HL)—Hardy-Weinberg equation conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D4.1.13 Hl Hardy Weinberg Equation Questions question 1

[Maximum number: 2]

In fruit flies (Drosophila melanogaster) the allele for long wings is dominant to the allele for short (vestigial) wings. In a laboratory population of 200 flies there were 168 with long wings. Using the Hardy-Weinberg equation, calculate the percentage of flies that would be heterozygous for this characteristic. Show your working.

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