Evolution & Domestication

Evolution & Domestication - "For two million years we...

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Dog Evolution Three main groups of dogs: 1) Hesperocyon – evolved in North America 40 million years ago; Looked like a cross between a weasel and a fox; Extinct 15 million years ago 2) Borophagines – About 34 million years ago; Larger hyena-like animals with large jaws and strong teeth; Extinct 2.5 million years ago 3) Canines – Includes all living species of canines
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Dogs – 1st animal domesticated Fossil and genetic evidence confirms all dogs are descendents of wolves Dogs have been around for millions of year and many are already extinct Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Carnivora Family: Canidae Genus: Canis Species: familiaris
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Dog Evolution & Domestication, cont. Earliest dog fossils reveal they were first domesticated in East Asia, perhaps China Dog DNA hair samples show most genetic variation here Suggests live there the longest, mixing and matching their genetic makeup Wherever they emerged, they followed humans around the globe Trotted the Bering Land Bridge to Alaska 12,000 yrs ago Remains in Latin America and Alaska matched European and Asian dogs Suggest originated from common ancestor (gray wolf)
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Definition of domestication The point at which the care, feeding, and breeding of a species come under the control of people Occurs when humans become the primary selection agents in the evolution of a specie
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Domestication Dogs have lived with humans for at least 15,000 years Today, dogs found in large numbers 5 per 100 people in Germany and Japan 10 per 100 people in U.K. 18 per 100 people in United States Cats were domesticated ~6,000 years ago Numbers approximate those of dogs
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WHY domestication occurred Matter of speculation Modern world wild dogs will visit to scavenge food Can buildup trust over a period of time Eventually, they might allow humans to handle them Human may have benefited from this by: Security around their encampment Detection of visitors (wild animals or other humans) and act as a warning system
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WHY domestication occurred, cont.
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