MetaFilter posts tagged with evolution and human

Prometheus In The Kitchen

The Whelk — Tue, 13 Oct 2009 07:48:07 -0800

"Good, big ideas about evolution are rare." Simon Ings of the Independent reviews "Catching Fire: How Cooking Made Us Human" by Richard Wrangham. (via)

Secrets Of The Phallus

hippybear — Tue, 05 May 2009 16:33:08 -0800

Why is the penis shaped like that? [T]he human penis is actually an impressive “tool” in the truest sense of the word, one manufactured by nature over hundreds of thousands of years of human evolution. You may be surprised to discover just how highly specialized a tool it is. Furthermore, you’d be amazed at what its appearance can tell us about the nature of our sexuality.

Neanderthal-Human Babies

wantwit — Thu, 20 Mar 2008 16:24:42 -0800

Any admixture would have to be driven by male Neanderthals. Two years ago we discussed morphological evidence of nontrivial interbreeding. Since then Neanderthal DNA has been examined for genetic support for this model of human evolution, largely contradicting the belief in Neanderthal contribution to modern humanity. Indeed any contribution from the Neanderthal gene pool to the evolution of modern humans might be very rare and indeed it appears that the best candidate gene thus (MC1R) far likely was a result of convergent evolution. EXCERPT: It is now clear that the level of interbreeding between the two populations, if any, was so low that we are unlikely to find any neutrally evolving Neanderthal alleles in modern populations. However, it is possible that low levels of interbreeding could have led to the adaptive transfer of some alleles between species (introgression). Beneficial alleles can persist in interspecific hybrids even when the hybrids are less fit than either parent population as long as the hybrids are fertile [37]. As hybrids back-cross to a parent population, most introduced alleles will be lost to drift or to negative selection; some beneficial alleles, however, may be maintained in subsequent generations. Claims have been made for adaptive introgression from Neanderthals into populations of modern humans at the microcephalin [38] and the tau [39] loci. Some proponents of the multiregional model have gone so far as to suggest that adaptive introgression was a primary source of beneficial alleles during the evolution of modern humans [40]. While we regard this latter idea as unsupported by the available Neanderthal and human genome sequences, it is worth considering the possibility that a very limited amount of adaptive introgression has occurred. MC1R is a good a priori candidate for adaptive introgression. It is thought that light skin is favored in Europe as a compromise between the need for vitamin D synthesis and the need to prevent folate photolysis, both caused by UV radiation [41]. Several genes affecting skin color are known to have been positively selected in European populations [21,22], though studies of MC1R evolution have come to different conclusions [22,42,43]. Jolly has pointed out that the easiest way for early modern humans entering Europe to evolve light skin would be to acquire the necessary genes from Neanderthals rather than to evolve them de novo [44]. If the low-activity MC1R variant is positively selected in Europe, then MC1R presents a good opportunity to test for evidence of adaptive introgression from Neanderthals to modern humans. However, although Neanderthals and modern Europeans share a low-activity MC1R phenotype, the genotype is different (see above), which argues against significant adaptive introgression. The hypothesis could be tested more rigorously using Neanderthal sequence from other loci affecting skin color with a clearer signal of positive selection in Europeans.

Australopithecus afarensis in the sky with diamonds

tugena13 — Tue, 28 Aug 2007 08:10:16 -0800

Lucy, one of the oldest and most complete fossilized hominid skeletons, is hitting the road. Although not without a little controversy. (And that's even before the creationists get wind of the tour!)

Life through time

Wolfdog — Mon, 04 Jun 2007 10:13:07 -0800

A slideshow & timeline of life on earth - A timeline of human migration.

The Simulacrisation of Technology into Life

0bvious — Wed, 15 Mar 2006 20:09:26 -0800

As the Pentagon ousts plans to turn insects into cyber war machines you'd be forgiven for asking the question: Where does the real digital end and the faked life begin? Are we simulating life synthetically? or just speeding up an entirely natural process? Technologically engineered life is here to stay. Its not far fetched to speculate that simulacra may become all there is.

The concept of the Transhuman: human, the self, consciousness and their effects on the law

0bvious — Tue, 13 Dec 2005 17:43:01 -0800

The first Transhuman Conference On the Law of Transhuman Persons: Whether or not you believe humans are set to evolve into gods, or AI is destined to achieve self-awareness the idea of the Transhuman is a thought provoking concept. Philosophers have debated the nature of the self, of the human for millennia. Is it time to start drafting new laws to govern all possible sentient beings on this planet? or is it all just a science of fiction? a comfortable humanist illusion?

Museum of the African Diaspora

trip and a half — Wed, 30 Nov 2005 21:08:21 -0800

MoAD is San Francisco's newest museum. The Museum of the African Diaspora is the latest addition to the SOMA neighborhood's expanding cultural riches, and promises to be fascinating (and, as far as I can tell, unique in the world). [more inside]