tag:blogger.com,1999:blog-37148773.post4087402550327991250..comments2024-03-27T14:50:47.345-04:00Comments on <center>Sandwalk</center>: Extending evolutionary theory? - Sonia SultanLarry Moranhttp://www.blogger.com/profile/05756598746605455848noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-37148773.post-65858472579970070502016-10-01T14:04:19.313-04:002016-10-01T14:04:19.313-04:00This comment has been removed by the author.Jim Menegayhttps://www.blogger.com/profile/06217224823822142530noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-60949032977036833542016-10-01T14:03:52.310-04:002016-10-01T14:03:52.310-04:00Back in the 1940s, Waddington offered a theory of ...Back in the 1940s, Waddington offered a theory of "canalization" in development. Why was this considered such a major revision in evolutionary theory that it was summarily rejected by orthodox defenders of the synthesis?<br /><br />It seems to me that ideas about epigenetics, Baldwin effects, and canalization are ideas in the second tier - not as important as the first tier ideas about selection and heritability, but at least important as the other major cluster of second tier ideas: those dealing with sympatry and allopatry.<br /><br />So call it a minor revision of evolutionary theory.Jim Menegayhttps://www.blogger.com/profile/06217224823822142530noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-46030357660211479932016-09-30T14:24:05.702-04:002016-09-30T14:24:05.702-04:00What determines which DNA bases are methylated in ...What determines which DNA bases are methylated in response to environmental stimuli?<br /><br />Like lutesuite, I really have to wonder why ID/creationists get in a lather over epigenetics. Perhaps they latch on to the idea that epigenetics somehow falsifies the theory of evolution which feeds into their God of the Gaps argument for ID.<br /><br />In the end, almost all of the methylation patterns in cells are wiped out during the process of gamete production. What little DNA methylation does make it through has very little impact on the resulting phenotype with respect to the differences between species. You may get fatter mice due to epigenetic factors, but you don't get cats from mice. The only explanation for the differences between divergent species is differences in DNA sequence, not epigenetics.Erichttps://www.blogger.com/profile/09481645265615126897noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-47081143272481754622016-09-30T12:14:42.358-04:002016-09-30T12:14:42.358-04:00Perhaps you can clear something up for me, Otangel...Perhaps you can clear something up for me, Otangelo: Why do some ID creationists get so excited about the idea of epigenetics? How would this increase the likelihood that life was created by God?Faizal Alihttps://www.blogger.com/profile/00937075798809265805noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-5531588414138860922016-09-30T12:03:25.875-04:002016-09-30T12:03:25.875-04:00Larry wrote:
"...........but rather takes sh...Larry wrote:<br /><br />"...........but rather takes shape through the interplay of genetic factors with the organism’s environmental conditions. "<br /><br />Not only genetic factors. But, very important and actually, essential: <br /><br />epigenetic factors. I have posted the list here several times. <br /><br />If these are not taken into consideration, the revision will not mirror and incorporate the new achievements and knowledge of various labs around the globe. <br /><br />At the topic " Where do complex organisms come from ", i have posted a list, which imho probably by far does not mention all mechanisms that determine body form and shape. ElShamah777https://www.blogger.com/profile/12608626398803379702noreply@blogger.comtag:blogger.com,1999:blog-37148773.post-14790378551039839502016-09-30T11:43:46.651-04:002016-09-30T11:43:46.651-04:00The lac operon is a great example. If you wanted ...The lac operon is a great example. If you wanted to use a human example you could point to tanning as a response to UV induced DNA damage from the environment. The discovery of this mechanism in humans didn't require a rewrite of the Modern Synthesis. Why?<br /><br />Fetal alcohol syndrome is suspected to be the result of epigenetic changes. If epigenetic changes can result in maladaptive phenotypes, then how can it be called an adaptive process?<br /><br />Ultimately, phenotype plasticity is a result of DNA sequence. The predictable response to a given environmental stimulus is controlled by sequence specific function. In order to get a different response to a specific stimulus you have to have a change in the underlying DNA sequence. How is this not exactly what the Modern Synthesis already states?Erichttps://www.blogger.com/profile/09481645265615126897noreply@blogger.com