Q35 - Hardy-Weinberg Expectations Across Generations of a Cross

Theoretical B Real exam question - full text reproduced under IBO's CC BY-NC-SA 4.0 license

Population Genetics & Hardy-Weinberg Equilibrium

Two pure breeding lines of Species X were crossed (Fig.). For each generation, 100 000 plants were allowed to breed. For the generations F1, F2 and F7, a specified number of plants were genotyped for the alleles A and a. The experimenter assumes no selection, no self fertilization and random mating after the first generation.

Breeding of pure lines in Species X; n is number of sampled plants. The central column gives number of individuals genotyped in each generation (only generations P, F1, F2 and F7 are shown).

Figure 1. Figure 1.

Using the information and data, determine which of the statements are true or which are false.

A. The parental generation (P) shows Hardy-Weinberg proportions

B. Expected number of Aa genotyped individuals in F1 is 110

C. Expected number of aa genotyped individuals in F2 is 90

D. In F7, 271 plants were genotyped as AA. This is less than expected

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Question reproduced from IBO 2015, Theoretical Exam B, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Community solutions (unofficial)