The Artificial Selection Experiments with Bristle Numbers in Drosophila Illustrated

The artificial selection experiments with bristle numbers in Drosophila illustrated which generality?

A) In such experiments, it is difficult to obtain individuals with traits that fall outside the range found in the original population.
B) Populations often contain considerable genetic variation upon which selection can operate.
C) Such experiments usually take thousands of generations to achieve their results.
D) Mutations occur to suit the needs of the population.
E) New species can be created via artificial selection.

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