The figure above shows the average for a quantitative trait (e.g. body size) ove

Question

The figure above shows the average for a quantitative trait (e.g. body size) over time in four isolated populations. Each replicate population started with 10 individuals and all replicates had the same average at the beginning of the experiment. After each round of reproduction, 10 individual were randomly chosen to begin the next generation and this process was repeated for 25 generations. Choose the evolutionary mechanism(s) responsible for the observed change in trait value (body size) * A)Drift B)Migration C)Selection D)Drift, Migration, and Selection E)Drift and Selection 510152025 Generations ELzi"OL68 azIS Apog azIS AD08

Explanation / Answer

A. Drift

The given population is of finite size and is reproductively isolated. Such populations undergo rapid changes in allelic frequencies in few generations due to phenomenon called genetic drift. This phenomenon is independent of mutation and natural selection. This explains the changes observed in trait of body size.

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