The molecular explosion
نویسندگان
چکیده
منابع مشابه
Molecular clocks: Defusing the Cambrian ‘explosion’?
You do not have to believe in punctuated equilibria — and given its status as ideological straw-man par excellence, why should you? — to accept that the history of life shows periods of rapid change separated by evolutionary longueurs of immense duration. In recent years, the socalled Cambrian ‘explosion’ has enjoyed the lion’s share of attention from those interested in periods of apparently r...
متن کاملMolecular clocks do not support the Cambrian explosion.
The fossil record has long supported the view that most animal phyla originated during a brief period approximately 520 MYA known as the Cambrian explosion. However, molecular data analyses over the past 3 decades have found deeper divergences among animals (approximately 800 to 1,200 MYA), with and without the assumption of a global molecular clock. Recently, two studies have instead reported ...
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The classical problem of the thermal explosion in a long cylindrical vessel is modified so that only a fraction alpha of its wall is ideally thermally conducting while the remaining fraction 1-alpha is thermally isolated. Partial isolation of the wall naturally reduces the critical radius of the vessel. Most interesting is the case when the structure of the boundary is a periodic one, so that t...
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Genetic evolution is slow. Progress in artificial intelligence is fast (Kurzweil 2005). Only a handful of genes separate Homo sapiens from our hominid ancestors on the African savannah. Among our 23,000-odd protein-coding genes, variance in single nucleotide polymorphisms accounts for just a small percentage of phenotypic variance in intelligence as measured by what we call IQ tests. True, the ...
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ژورنال
عنوان ژورنال: Nature
سال: 1995
ISSN: 0028-0836,1476-4687
DOI: 10.1038/373558a0