Humans have selectively bred many radically different domestic animals. (For example, think of St. Bernard and chihuahua dogs.) Does this activity result in evolution? Why or why not?
What will be an ideal response?
Selective breeding of domestic animals is artificial selection, where specific traits are selected to fulfill some human purpose, such as to increase meat yield or for a particular aesthetic reason. Evolution results from the environmental imposition of conditions that determine the fitness of individuals and the resulting proportion of alleles among individuals of future populations. Therefore, artificial selection, by definition, cannot result in evolution.
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