Chatterers love to ignore facts. Such as the fact that species adapt to environmental changes faster than can be explained by random genetic mutation which are then selected for survival in the new environment.
Some of them throw out lots of vague fog, like promoting this Graham guy. Some can only distort what people say and demand backup information without providing any themselves. S. is useless for advancing any enquiry. Thanks to Hari for flagging that long ago Waddington produced experimental facts that disprove the dogma insisting species change must start from random mutations. Conrad Waddington and the origin of epigenetics (brief excerpt) Denis Noble, J Exp Biol (2015) 218 (6): 816–818. In 1956, the British developmental biologist, Conrad Waddington, published a paper in the journal Evolution in which he succeeded in demonstrating the inheritance of a characteristic acquired in a population in response to an environmental stimulus. He knew from his developmental studies that embryo fruit flies could be persuaded to show different thorax and wing structures, simply by changing the environmental temperature or by a chemical stimulus. In his landscape diagram, this could be represented as a small manipulation in slope that would lead to one channel in the landscape being favoured over another, so that the adult could show a different phenotype starting from the same genotype. The next step in his experiment was to select for and breed from the animals that displayed the new characteristic. Exposed to the same environmental stimulus, these gave rise to progeny with an even higher proportion of adults displaying the new character. After a relatively small number of generations, he found that he could then breed from the animals and obtain robust inheritance of the new character even without applying the environmental stimulus. The characteristic had therefore become locked into the genetics of the animal. https://journals.biologists.com/jeb/article/218/6/816/14495/Conrad-Waddington-and-the-origin-of-epigenetics -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#34833): https://groups.io/g/marxmail/message/34833 Mute This Topic: https://groups.io/mt/110792212/21656 -=-=- POSTING RULES & NOTES #1 YOU MUST clip all extraneous text when replying to a message. #2 This mail-list, like most, is publicly & permanently archived. #3 Subscribe and post under an alias if #2 is a concern. #4 Do not exceed five posts a day. -=-=- Group Owner: [email protected] Unsubscribe: https://groups.io/g/marxmail/leave/13617172/21656/1316126222/xyzzy [[email protected]] -=-=-=-=-=-=-=-=-=-=-=-
