The artificial selection experiments with bristle number in Drosophila illustrate which of the following generalities?
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) A particular phenotype can be produced by more than one genotype.
D) Such experiments usually take thousands of generations to achieve their results.
E) Bristle number is a genotype, not a phenotype.

Question

Quizplus · Accepted Answer

The artificial selection experiments with bristle number in Drosophila demonstrate that populations often contain considerable genetic variation upon which selection can operate. This is because the selection experiments found that there was a range of bristle numbers in the original population, and through selective breeding, they were able to increase or decrease the average bristle number.

The Artificial Selection Experiments with Bristle Number in Drosophila Illustrate