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Description
Dr. Manton is a cat breeder and she explains the process of artificial selection starting with a Siamese cat crossed with a Persian and ending with several exotic variations after years of careful ...breeding and crossing. In natural selection a mutation will only make itself felt in the population if it confers on the individual some selective advantage. The points to be made are that selection is a very real thing and can be very exactly controlled. That a knowledge of genetics is of tremendous importance to anyone who breeds animals or plants and that the nature of a species, even humans, could be changed by selection.
Subtitle Number Time In Time Out Subtitle Text
7900:06:08,00000:06:10,000..about genetics you can really take short cuts compared to…
8000:06:11,00000:06:13,000..the ordinary breeder who might be doing a bit of chopping?
7300:06:12,00000:06:13,000..which disappear against their background.
8100:06:13,00000:06:14,000Sidnie Manton: Oh yes, oh yes, yes you can.
7400:06:14,00000:06:18,000And so in 100 years with the spread of atmospheric pollution and…
8200:06:15,00000:06:17,000Yes if you know what genetics is - of course the chances of…
8300:06:17,00000:06:19,000..getting what you want may be pretty thin. I mean at one point…
7500:06:19,00000:06:21,000..the appearance of more and more trees with sooty bark…
8400:06:20,00000:06:24,000..getting the chocolates, our chances were one in 32 of getting what we wanted.
7600:06:22,00000:06:27,000..the dark mutant has replaced the pale form in large areas of this country.
8500:06:25,00000:06:28,000And then it was whittled down to one in 16, one in eight, one in two…
8600:06:29,00000:06:34,000..but here you’ve got as good a colour point as we can get at the present day.
8700:06:35,00000:06:37,000These are in the older colours and you see that they are…
8800:06:38,00000:06:42,000more Persian in type than the new colours I showed you just now.