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Thread: Natural selection

  1. #1 Natural selection 
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    May 2006
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    Sorry if I'm posting a lot of questions, but can anyone list the principles of natural selection. I know over reproduction is one. Anything else?


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  3. #2  
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    Natural selection was the fundamental basis of Darwins original theories of evolution.

    In the modern view:

    A) random mutation (alteration) of organisms genetic material creates diversity within populations

    B) according to the context of the environment (which includes the biological environment e.g. competition within and between species, and the aboitic environment e.g. the climate and landscape) some mutations may increase an organisms chance of producing more successful offspring (either by surviving for longer or by increasing reproductive success, for example). Others (the majority) will be deleterious and decrease the chance of reproducing.

    C) genetic material that is reproduced accumulates in populations to a greater frequency than genetic material that is not reproduced

    So, organisms with favourable mutations reproduce to yield offspring (which also carry that mutation) and more copies of that mutation become spread through the population as a whole.


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