RE: Test My Theory: Macro evolution DOES happen?
December 19, 2016 at 4:28 am
(This post was last modified: December 19, 2016 at 4:31 am by Amarok.)
it's funny road kill accuses others of accuracy of statements without a shred of evidence for his claim about fossils (that aren't from creationist sites) and is contradicted by just about every expert on the subject but of course he'll just repeat his loopy conspiracy theories
Good post
But he's still massively exaggerating the state of the fossil record
(December 19, 2016 at 4:27 am)downbeatplumb Wrote:(December 19, 2016 at 1:12 am)RoadRunner79 Wrote: How did you come to that conclusion? I don't see the multiplication and addition of micro + time resulting in macro... what is your evidence or reasoning for this claim?
Also, in most of the fossil record we see either very small differences, over very large periods of time, and fairly large changes over relatively short periods of time. How do you account for this as you have defined things here?
That would be down to the evolutionary pressures, if the environment favours the current body it does not change much.
https://en.wikipedia.org/wiki/Coelacanth
But at other times the environment changes or another creature starts to invade the territory or lady squid start liking men squid with extra large tentacles.
Then you see relatively rapid changes.
https://en.wikipedia.org/wiki/Darwin%27s_finches
Quote:Developmental research in 2004 found that bone morphogenetic protein 4 (BMP4), and its differential expression during development, resulted in variation of beak size and shape among finches. BMP4 acts in the developing embryo to lay down skeletal features, including the beak.[28] The same group showed that the development of the different beak shapes in Darwin's finches are also influenced by slightly different timing and spatial expressions of a gene called calmodulin (CaM).[29] Calmodulin acts in a similar way to BMP4, affecting some of the features of beak growth. The authors suggest that changes in the temporal and spatial expression of these two factors are possible developmental controls of beak morphology. In a recent study genome sequencing revealed a 240 kilobase haplotype encompassing the ALX1 gene that encodes a transcription factor affecting craniofacial development is strongly associated with beak shape diversity
So sometimes subtle tweeks can exert large influences on body or in this case beak shape and will of course be due to evolution proceses.
Quote:During the survey voyage of HMS Beagle, Darwin was unaware of the significance of the birds of the Galápagos. He had learned how to preserve bird specimens while at the University of Edinburgh and had been keen on shooting, but he had no expertise in ornithology and by this stage of the voyage concentrated mainly on geology.[8] In Galápagos he mostly left bird shooting to his servant Syms Covington.[9] Nonetheless, these birds were to play an important part in the inception of Darwin's theory of evolution by natural selection.
On the Galápagos Islands and afterward, Darwin thought in terms of "centres of creation" and rejected ideas concerning the transmutation of species.[10] From Henslow's teaching, he was interested in the geographical distribution of species, particularly links between species on oceanic islands and on nearby continents. On Chatham Island, he recorded that a mockingbird was similar to those he had seen in Chile, and after finding a different one on Charles Island he carefully noted where mockingbirds had been caught.[8] In contrast, he paid little attention to the finches. When examining his specimens on the way to Tahiti, Darwin noted that all of the mockingbirds on Charles Island were of one species, those from Albemarle of another, and those from James and Chatham Islands of a third. As they sailed home about nine months later, this, together with other facts, including what he had heard about Galápagos tortoises, made him wonder about the stability of species.[11][12]
Following his return from the voyage, Darwin presented the finches to the Zoological Society of London on 4 January 1837, along with other mammal and bird specimens that he had collected. The bird specimens, including the finches, were given to John Gould, the famous English ornithologist, for identification. Gould set aside his paying work and at the next meeting, on 10 January, reported that the birds from the Galápagos Islands that Darwin had thought were blackbirds, "gross-beaks" and finches were actually "a series of ground Finches which are so peculiar [as to form] an entirely new group, containing 12 species". This story made the newspapers.[13][14]
Darwin had been in Cambridge at that time. In early March, he met Gould again and for the first time got a full report on the findings, including the point that his Galápagos "wren" was another closely allied species of finch. The mockingbirds that Darwin had labelled by island were separate species rather than just varieties. Gould found more species than Darwin had expected,[15] and concluded that 25 of the 26 land birds were new and distinct forms, found nowhere else in the world but closely allied to those found on the South American continent.[14] Darwin now saw that, if the finch species were confined to individual islands, like the mockingbirds, this would help to account for the number of species on the islands, and he sought information from others on the expedition. Specimens had also been collected by Captain Robert FitzRoy, FitzRoy’s steward Harry Fuller and Darwin's servant Covington, who had labelled them by island.[16] From these, Darwin tried to reconstruct the locations from where he had collected his own specimens. The conclusions supported his idea of the transmutation of species.[14]
Good post
But he's still massively exaggerating the state of the fossil record
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