
Originally Posted by
Tiberius
Human bodies aren't machines made to do everything perfectly, which leads to mutations. The sperm or egg may have some small mutations, and when they fuse, the mutations are present in every single replicated cell for the foetus, which has a change. Normally, under uncivilised conditions, an animal would gain some different traits, eg perhaps being an albino. Now, if you were an albino in the North Pole, and hence were a camouflaged predator or prey, it is an advantage, and the chance of you living long enough to reproduce is increased. Similarly, an albino herbivore prey living in the jungle will get spotted and made into lunch quickly, and die before it can reproduce. Hence, the more wanted traits will get passed down more, and the species changes. I forgot the link and the site, but I've read an article showing that even in the past 100 years or so, the 'tall' gene has become more prevalent within the homo sapiens species.
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