tag:blogger.com,1999:blog-3734925856292601239.post2577874152983676376..comments2024-03-19T03:20:05.162-04:00Comments on Evo and Proud: Farewell to HenryPeter Frosthttp://www.blogger.com/profile/04303172060029254340noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-3734925856292601239.post-2897481708481426572017-06-27T12:51:24.782-04:002017-06-27T12:51:24.782-04:00Hopefully you will return with New entries soon.
T...Hopefully you will return with New entries soon.<br />Thanks Peter for everything so far.Marchttps://whyevolutionistrue.wordpress.com/noreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-20662985027906029072017-05-25T23:53:59.994-04:002017-05-25T23:53:59.994-04:00They dont live in the bush in east africa. The eth...They dont live in the bush in east africa. The ethiopians were also not regarded as barbars in ancient times. The germanic tribes, the roots of the anglo saxon americans were regarded barbarsAnonymoushttps://www.blogger.com/profile/18100611430614996605noreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-42439268125619993002017-04-21T04:52:08.588-04:002017-04-21T04:52:08.588-04:00Thanks for keeping this blog up! I've read a ...Thanks for keeping this blog up! I've read a huge volume of primary materials from many different societies, but I wanted to know if they held true for societies that weren't entirely literate. The sources for European, Middle Eastern, Chinese, Japanese, Korean, and Indian standards of beauty and STEREOTYPES of beauty are so fascinatingly similar that I wanted to know if other places held the same ideas. Paleness is beauty and nobility--but also fragility, femininity, virtue but of the passive types, and might reveal a weakness not only of body but of intelligence, and may be cold or "bad in bed" (and it may include sophisticated deceit, if wicked). Darkness is ugly and peasantry--but also strong, hardworking, earthy, lusty, and loyal (though possibly also evil), and it may be associated with peasant/dumb but it can also be associated with a healthy intelligence and body (as opposed to the supposedly weak intelligence and body of the pale type). These are stereotypes of literally every culture that I have ever found mention the very ideals of beauty. It is so completely bizarre but very true. I am very pale. I got far more job offers with a moderate bronzer than I did in my natural state, and I was taken more seriously.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-19937876306848965102016-11-01T21:48:37.894-04:002016-11-01T21:48:37.894-04:00Ric, in a growing population natural selection is ...Ric, in a growing population natural selection is more effective: in a declining population each female might have, on average, less than one offspring, whereas in a growing population each female might have, on average, more than one offspring. The probability of fixation of a new mutation is very, very low in general-- even if that mutation confers an advantage. However, as the population becomes bigger and bigger, you see in population genetic simulations that beneficial allelic mutations become more likely to make it past the point at which they are likely to become extinct more often than they do in small population.Anonymoushttps://www.blogger.com/profile/00364958395618558649noreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-64695890257501459812016-09-20T23:37:29.887-04:002016-09-20T23:37:29.887-04:00I wonder if dogs left a detectable signature in th...I wonder if dogs left a detectable signature in the genome of European hunters. <br /><br />There would have been greater social independence of lone hunters, aided by friendly canines. That might also have atrophied eusocial competence. What are the genes involved in that?Jim Boweryhttps://www.blogger.com/profile/12686155123469135528noreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-77841739698026713112016-06-25T22:39:59.951-04:002016-06-25T22:39:59.951-04:00OK, thanks for the link, so yes, it's populati...OK, thanks for the link, so yes, it's population expansion, aka 2 humans have twice as many mutations as one human. The rest is important, but sort of irrelevant. <br />To me this is not the right conceptual framework to think Evolution.Ricnoreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-55857289329826186002016-06-21T20:16:41.682-04:002016-06-21T20:16:41.682-04:00Ric,
I will eventually return to blogging. At pre...Ric,<br /><br />I will eventually return to blogging. At present, I am overwhelmed by work and have very little free time. There are also unresolved problems at The Unz Review.<br /><br />The term 'accelerated evolution' is not my own. Unless I am mistaken, it was coined by John Hawks, who explains it on his weblog:<br /><br />http://johnhawks.net/weblog/topics/evolution/selection/acceleration/accel_story_2007.html?seemore=y][b][i]John<br /><br />Human evolution accelerated partly because a growing population increased the number of promising mutations. The main reason, however, was the entry of humans into a growing diversity of environments, initially natural environments and then cultural environments. <br /><br />The second reason was much more important than the first. There are many cases of large populations that evolve at a very slow rate. They evolve slowly because their environment is changing slowly. So selection is a matter of finding a better fit to an existing situation. As John Hawks argues:<br /><br />"... the ecological changes documented in human history and the archaeological record create an exceptional situation. Humans faced new selective pressures during the last 40,000 years, related to disease, agricultural diets, sedentism, city life, greater lifespan, and many other ecological changes. This created a need for selection.<br /><br />Larger population sizes allowed the rapid response to selection -- more new adaptive mutations. Together, the two patterns of historical change have placed humans far from an equilibrium. In that case, we expect that the pace of genetic change due to positive selection should recently have been radically higher than at other times in human evolution."Peter Frosthttps://www.blogger.com/profile/04303172060029254340noreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-85973637770061817642016-06-15T12:55:23.357-04:002016-06-15T12:55:23.357-04:00RIP.
As a relief, consider that what goes around ...RIP. <br />As a relief, consider that what goes around comes around. <br /><br />Hi Peter, I am an old reader of your blog, which I thought you left. I read about your come back from the other blog and I am happy to read you again here, but now, this post is from April. So i wonder, Is it still going on ?<br /> <br />In the past, I was curious about the expression 'accelerated Evolution'. I first assumed that you meant 'increased number of mutations' per length of DNA per unit of time. But I understood that it is instead the number of mutations FIXED by Natural Selection that you are considering, and according to you, this number is increasing during gene/culture coevolution. <br />Does this imply that the raw mutation rate is NOT a limiting factor ? and that there is always more mutations than the Natural Selection can select. If that was not the case and the mutation rate was a limiting factor, the maximal rate of Selected Mutations per generation would simply become the mutation rate.<br />The raw number of mutation in an entire population is also dependent of the total length of DNA considered. That is, in a big population of 1000 individuals, there in 1000 more DNA susceptible to mutations than in a population of 1 individual. <br />Said otherwise, In a big population, you can have many more mutations than in a small one, and therefore, even if the mutation rate per se was a limiting factor in a small population, having more individuals may overcome this limitation. <br /><br />You mention an increase of around a hundred fold or more, that could be such an effect of population size. That is, if the population increases a 100 fold, then there is a 100 fold more mutations to grab for Natural Selection.<br />However, at the level of the individual (and for the same amount of DNA), the mutation rate is still the same. One way to increase this rate a 100 fold is a drastic manipulation of the proof reading activity of the DNA polymerase, for example. This is the way that some Bacteria respond to environmental change : during stress, they manipulate their own DNA-proof reading activity during DNA replication, which effectively increases the true mutation rate, but at the cost of many lethal mutations. They also manipulate the interspecies molecular barrier, which normally prevent the DNA of different species to recombinate with the host bacterial dna. Bacteria can be promiscuous, with foreign DNA inside them from who knows which origins. But for recombination to occur between their own DNA and this extra DNA, long stretch of identical sequence must be present, which send the signal that this extra DNA is from the same species and can therefore be used for recombination, and generate novelty. During Environmental stress however, this system is shut down, and recombination can occur between non-perfectly homologous DNA, generating even more novelty. In any case, Bacteria have several systems to increase their true 'evolution rate' and generate novelty and adaptation to environmental change. But it seems that this is always at the cost of more lethal mutations, aka many more death in the bacterial population. <br />I may be wrong but don't think that such systems exists for humans. Therefore it is not the true mutation rate that is changing in human and the term 'Accelerated Evolution' is confusing in my opinion. Perhaps epigenetic changes can results in creating more novelty, but a ...100 fold, I don't know.<br />Are you suggesting, or are you suspecting, that something like the bacterial systems (perhaps more refine), exists for humans too ? <br />Can you elaborate on what you mean by 'Accelerated Evolution' and are you talking about the entire population, or for single individuals ? Ricnoreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-59956345188837942662016-04-09T05:54:53.806-04:002016-04-09T05:54:53.806-04:00Commenting on your December blog, whatever is happ...Commenting on your December blog, whatever is happening in Europe now may well answer the age old question, how were the Neanderthals replaced. The theory that the brighter and more advanced smaller blacks from Africa just moved in does not wash, has never washed but the genetic research that has been done in the last few few years may just point to a more reasonable solution. The recent news that there far too little y chromosone can explain all that. The smaller blacks, fleeing either population or natural disaster come into contact with the larger, brainier Neanderthal who promptly clobber the men and f**k the women. It is what stronger groups have done ever since populations came into contact. The smaller Blacks are unable to birth large-headed half-breeds, If its is small head and a boy it does not survive childhood, if it is a girl she can do the dishes and keep the men warm at night.<br />It is unlikely that the Neanderthal men on their own could have evolved a society that could survive the harsh winters, I believe it needed female co-operation. Since the Neanderthal infant mortality rate was likely very much higher it does not take all that many generations for Neanderthal to totally die out.<br /><br />I have lived in Africa before all that independence nonsense, I have seen how the live in the bush in Congo and East Africa and there just is no way they could compete with a tribe tht has learned to survive an ice age.<br /><br />Unfortunately I have studied neither anthropology or genetics so I do not know if my ideas are totally crazy or could have some basis in fact. Would love to know which it is.Dieternoreply@blogger.comtag:blogger.com,1999:blog-3734925856292601239.post-35000096779512648162016-04-08T11:45:56.340-04:002016-04-08T11:45:56.340-04:00A nice tribute to a man who deserved it.A nice tribute to a man who deserved it.Tedhttps://www.blogger.com/profile/09906644298805145995noreply@blogger.com