The Artificial Selection Experiments with Bristle Numbers in Drosophila Illustrate

Multiple Choice

The artificial selection experiments with bristle numbers in Drosophila illustrate 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) Mutations are random with respect to the adaptive needs of organisms.