Igcse Model Questions Vol1 2025 Biology Question 11

Practice objective / multiple choice question 11 from the 2025 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2025 Biology Objective / Multiple Choice Medium Difficulty

Question 11 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

In a large population of a plant species the recessive phenotype (aa) occurs in \(9\%\) of individuals. Assuming Hardy-Weinberg equilibrium, calculate (a) the expected frequency of heterozygotes (Aa). (b) If individuals with genotype aa have a 40\% lower chance of surviving to reproduce, what is the expected heterozygote frequency in the next generation? Give your answer as a percentage to one decimal place.

Answer Options

A. a) 45.0 %; b) 41.5 %

B. a) 38.0 %; b) 35.0 %

Correct Answer C. a) 42.0 %; b) 39.8 %

D. a) 40.5 %; b) 37.2 %

Correct Answer

Correct Option:

a) 42.0 %; b) 39.8 %

About This Question

This is Igcse Model Questions Vol1 2025 Biology Question 11. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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