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NOVA - Dogs and More Dogs

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"NOVA presents the story of dogs and how they evolved into the most diverse mammals on the planet.
The program:
discusses the evolution and remarkable diversity of dogs.
notes that there are currently more than 400 different breeds of dogs worldwide.
relates two competing theories about how dogs were domesticated: Stone Age humans adopted and selectively bred wolves for tameness; wolves essentially ""chose"" domestication when they began to forage for food near prehistoric dumps. There, tameness was an advantage.
considers why dogs have tails that stick up, droopy ears, and other traits that are not found in the wolf gene pool.
recounts an experiment in which foxes bred for tameness produced dog-like traits, leading to speculation that the new traits were due to different levels of hormones created as a byproduct of tameness.
explores how dominance hierarchies in wolf society have contributed to making dogs well suited to be pets.
suggests that dogs specialized in specific behaviors—hunting, tracking, pointing, retrieving—and that over thousands of years humans used food to reward the dogs best at these behaviors. These better-fed dogs then had an improved chance at surviving and passing on their genes.
proposes a theory that the diversity found in dogs is due to subtle changes in the regulatory DNA that instructs when a gene turns on and off.
suggests that dogs' remarkable ability to adapt to different environments is due to an extended critical period of social development.
reviews the problem of genetic diseases due to extensive inbreeding."

Duration 56m01s
Resolution 608x368
Video format Xvix
Audio format AC3
Language english
Subtitles 0