By Carol Beuchat PhDIn all animals, traits are altered from one generation to the next by natural or artificial selection. Genes for beneficial traits are preferentially passed on to offspring, while genes for detrimental traits are not. Over many generations, these gradual changes in gene frequency can add up to produce dramatic changes in size, shape, and behavior, and there is no better example of this than in dogs. How did the wolf, which has no special affection for humans, become our [...]
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