LIFESCI 2D03 Chapter Notes - Chapter 2: Seed Predation, Heredity, Carotenoid
4 Nov 2013
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2. 1 evolution by natural selection favors behavioral adaptations that enhance fitness. Each breed possesses unique trait features with respect to body size and shape, tail length, head shape, coat, texture, and color. All breeds of dogs have descended from the gray wolf (canis lupus), and the ancestors are a result of human manipulation of the breeding of individuals over the past 14, 000 years. This is through the selection of individuals that possess certain traits for a particular breed, called the breed standard. Breeders allow reproduction only among individuals that possessed certain traits. Differences in breed standards over time eventually led to ever-greater differences among the dog breeds we see today this process is known as artificial selection because it is done artificially that is, by humans. Similar processes also occur naturally, called natural selection: is the differential reproduction and survivorship among individuals within a population. It is the mechanism that results in adaptive evolution charles darwin and alfred russell.
