Evolution from my point of view

Discussion of everything related to the Theory of Evolution.

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Evolution from my point of view

Post by BioSULTAN » Tue Apr 26, 2011 6:36 am

What is evolution?
biology is study of life. what is life mean? a life is a self-sustained chemical system capable of undergoing Darwinian evolution. In genetic textbooks evolution is defined as “change in frequency of genes in a population”. Another definition we meet is that evolution is” heritable changes in a population over many generations” and this seems correct. Changes that occur during lifetime of organism such as developing of embryo or aging processes as well as mutations in nongermline cells are not counted as evolution.
replicator is the word is given to a thing which can self replicate. Genes are fundamental replicators as Dawkis thought(1976).

“Error-prone self replication” is one point insists that not all copies should be the same as the original one. and if it happens that means there is no evolution because there would be no differentiations on which natural selection could act. Furthermore, By incorrectly replication modern-day genes have been arisen. So we can say that errors are extremely important for evolution in the way they do not occur very often; unless there will be no genetic information could be passed on to the next generation.

since there is variation in error at self replication, there is variation in success at self replication. if all organisms are survived and multiplied by the same rate then there is no frequency in variations so there is no evolution. When there is limited in a population there will be unbalance between organisms some will over others. The expected number of offspring any organism reflects its fitness. Those organisms which have higher fitness will increase in number relative to those lower fitness this is the principle of natural selection.

in my point of view, all we need is some kind of replicator and the notion of fallibility. Nothing is perfect and some errors are likely to occur during replication. In addition, resources are unlimited so replicators have varying success. Finally, and for bioinformaticians there can be no better example for evolution than looking at a sequence alignment because the fact that similar genes can be found in different organisms.


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Post by DMRSekhar » Mon May 30, 2011 9:32 am

You may like to see this link.
http://knol.google.com/k/dmr-sekhar/gen ... 1lxcn2/36#


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