WEBVTT 00:00:00.233 --> 00:00:03.469 We all grew up believing it would take long periods of time, 00:00:03.469 --> 00:00:07.674 a slow process of evolution, in order to involve, 00:00:07.674 --> 00:00:10.910 in order to transform a wolf into a dog. 00:00:10.910 --> 00:00:14.848 But, boy, from the archaeological records or whatever, 00:00:14.848 --> 00:00:17.384 it was an instant of time. 00:00:17.384 --> 00:00:22.822 How could it be possible for one species to evolve suddenly into another. 00:00:22.822 --> 00:00:25.425 Clues were to emerge unexpectedly from 00:00:25.425 --> 00:00:28.194 an experiment conducted in the old Soviet Union. 00:00:32.732 --> 00:00:35.735 I really think that the Belyaev experiments was one of the most 00:00:35.735 --> 00:00:38.338 significant experiments in 00:00:38.338 --> 00:00:41.541 evolution that took place in the twentieth century, 00:00:41.541 --> 00:00:48.014 and it affected my life and my thinking in so many ways. 00:00:48.014 --> 00:00:53.453 The experiment was begun in the 1950s at a fox farm in Siberia. 00:00:53.453 --> 00:00:55.455 The foxes were being bred for their fur, 00:00:55.455 --> 00:00:58.391 but they were wild animals that were hard to handle and 00:00:58.391 --> 00:01:00.393 often too stressed to breed. 00:01:04.096 --> 00:01:07.767 Dmitry Belyaev, a geneticist, was taken on to see if he could 00:01:07.767 --> 00:01:11.070 develop foxes that would be easier to keep. 00:01:11.070 --> 00:01:13.673 He began his experiment by breeding together those 00:01:13.673 --> 00:01:16.242 foxes with the least excitable temperaments. 00:01:18.411 --> 00:01:21.714 Belyaev selected foxes by a simple method. 00:01:21.714 --> 00:01:24.984 He extended a gloved hand into each animal's cage. 00:01:24.984 --> 00:01:27.687 The foxes that attacked, cowered, 00:01:27.687 --> 00:01:33.693 or bit him were excluded from breeding. 00:01:37.597 --> 00:01:39.165 But those that showed tolerance 00:01:39.165 --> 00:01:42.202 or curiosity were mated together. 00:01:42.202 --> 00:01:47.373 In effect, Belyaev was selecting the foxes for their flight distance. 00:01:47.373 --> 00:01:50.677 The subsequent results were staggering. 00:01:50.677 --> 00:01:53.179 The new generations of foxes were transformed, 00:01:53.179 --> 00:01:56.216 not just in behavior but in their appearance. 00:01:56.216 --> 00:02:01.688 Within just ten years, the selected foxes showed new 00:02:01.688 --> 00:02:03.690 variety in their color. 00:02:05.024 --> 00:02:07.527 Some were born with mottled coats or black 00:02:07.527 --> 00:02:10.363 and white patches. 00:02:10.363 --> 00:02:12.031 Their ears became floppy. 00:02:12.031 --> 00:02:15.134 They started to bark, vocalize. 00:02:15.134 --> 00:02:19.339 They became highly playful even into adulthood and were no 00:02:19.339 --> 00:02:21.341 longer afraid of people. 00:02:25.245 --> 00:02:28.181 Some of the foxes even began to answer to their names. 00:02:31.751 --> 00:02:35.455 Belyaev had stumbled across the discovery that selecting for the 00:02:35.455 --> 00:02:38.157 quality of tameness alone could 00:02:38.157 --> 00:02:40.527 set off a cascade of other changes. 00:02:42.161 --> 00:02:45.398 We can still see evidence of this quantum leap at the same 00:02:45.398 --> 00:02:49.702 research center today. 00:02:49.702 --> 00:02:52.672 Up to that point, we all kind of believed Darwin, 00:02:52.672 --> 00:02:57.010 and Darwin said nature does not go in leaps. 00:02:57.010 --> 00:02:59.078 Things don't happen fast. 00:02:59.078 --> 00:03:00.914 They happen gradually. 00:03:00.914 --> 00:03:05.084 And the answer was with Belyaev experiment - he was wrong. 00:03:05.084 --> 00:03:07.987 They do go in leaps and sometimes big leaps. 00:03:07.987 --> 00:03:09.889 Things that you wouldn't expect. 00:03:09.889 --> 00:03:12.992 The theory is here that we're dealing with some underlying 00:03:12.992 --> 00:03:14.093 structure. 00:03:14.093 --> 00:03:15.662 When we're dealing with tameness, 00:03:15.662 --> 00:03:19.632 we're dealing with a set of genetics that is producing a 00:03:19.632 --> 00:03:23.469 characteristic response. 00:03:23.469 --> 00:03:26.339 It is not a coincidence that many domesticated animals are 00:03:26.339 --> 00:03:27.907 black and white. 00:03:27.907 --> 00:03:29.909 When selection is made for tameness, 00:03:29.909 --> 00:03:32.512 it impacts on the entire makeup of the animal. 00:03:35.582 --> 00:03:37.951 Scientists have determined that adrenalin, 00:03:37.951 --> 00:03:42.455 the fight or flight hormone, and melanin, the skin and fur pigment, 00:03:42.455 --> 00:03:46.192 are chemically connected, so they change together, 00:03:46.192 --> 00:03:49.796 as are the neurotransmitters dopamine and noradrenaline which 00:03:49.796 --> 00:03:51.564 control behaviors. 00:03:51.564 --> 00:03:57.103 Affect one system, and there is a domino effect from color to behaviors. 00:04:00.506 --> 00:04:03.743 Koppenja's scavenging wolves may have undergone a similar 00:04:03.743 --> 00:04:04.744 transformation. 00:04:04.744 --> 00:04:08.114 When all of a sudden Belyaev's experiments... 00:04:08.114 --> 00:04:15.254 It changed the way a lot of us began to think about dogs. 00:04:15.254 --> 00:04:17.624 People talked about... 00:04:17.624 --> 00:04:21.427 Why did people select dogs to have this coat color or 00:04:21.427 --> 00:04:23.162 that coat color and so on? 00:04:23.162 --> 00:04:27.100 Why did people select dogs to bark? 00:04:27.100 --> 00:04:29.836 And then all of a sudden we realized those were a bunch of 00:04:29.836 --> 00:04:31.838 really silly questions, 00:04:31.838 --> 00:04:36.809 because we could get all of that just by selecting for tameness. 00:04:36.809 --> 00:04:41.781 Belyaev created foxes that looked and behaved like dogs. 00:04:41.781 --> 00:04:45.351 His experiment suggested that the transformation of the wild 00:04:45.351 --> 00:04:49.188 wolf into the dog could have happened in the blink of an 00:04:49.188 --> 00:04:51.424 evolutionary eye. 00:04:51.424 --> 00:04:54.594 The stage was set for the development of the dog 00:04:54.594 --> 00:04:57.630 into the incredible variety we have today.