In the The Ancestor’s Tale, Dawkins describes two misconceptions (which he refers to them as temptations) of the history of evolution. The first temptation is that historians tend to search for patterns in the history of evolution that tend to repeat themselves. The second temptation deals with the conceit of hindsight and with what Dawkins calls the “vanity of the present.” The misconception is that historians/individuals tend to believe that the past works to deliver the present and that evolution has reached a “perfect” state and evolution is finished. I personally believe that evolution will most likely never end, but if there is an end point I believe that there is a long way to go before evolution finally reaches an end point. We must avoid such temptations and remain objective when recording the history of evolution.
Moreover, Dawkins describes the Templeton’s method in determining the timing and history of migration from Africa which was based in the concept of tracing conserved segments of a genome referred to as haplotypes. Furthermore the Y-Chromosome Adam (all male lineage) and mtDNA eve (all female lineage), which are part of the same MCRA, where also used by scientist to determine the timing and history of human migration. From this, the idea of three migrations arose, and idea which Dawkins supports. However, Dawkins also believes that the entire story of the evolution of human is not known and that many more recent ancestors may still be found.
Sunday, November 15, 2009
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Good entry. The migration out of Africa has may theories, Dawkins argues most with Templeton's theory because he used lots of seperate genes instead of just one to reach his conclusion.
ReplyDeleteThere probably is a lot more that we can find out about our migration and our ancestors. Hopefully we can find out more soon.
ReplyDeleteGreat post. I liked you consice explanation of the mtDNA and the Y-Chromosome concept and its relation to the migration out of Africa.
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