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Unformatted text preview: particular coat color in dogs, are selected for by allowing only individuals that possess the trait to reproduce, while those that lack the trait are prevented from reproducing. Because it lacks the control of fitness needing to increase fitness, artificial selection can cause problem traits to predominate in a species. For example, Dobermans are a breed of dog that has been bred for a certain appearance. In the process of selecting for this appearance, a genetic defect has increased in frequency in the population. This defect causes narcolepsy, a condition that causes these dogs to uncontrollably fall into deep sleep. Clearly, this condition does not increase the animal's fitness and would be strongly selected against by natural selection. However, since these animals have been subjected to artificial rather than natural selection for generations, the defect has spread in the population....
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- Winter '09