- Feb 4, 2006
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It is called "mutation". All offspring differ slightly from their parents. Example:
A child born in a dense jungle environment and has the genetic mutation that will make it grow tall will have a severe disadvantage compared to its brethren who are short. Pygmies can move much more easily in dense jungle than tall people. The oposite is true of savannah dwelling people who are taller.
Any mutation that gives an advantage will help the life form survive long enough to procreate and pass on its genes.
This is how evolution works. Without mutation (DNA replication does not produce exact and perfect copies) there can be no evolution and should the environment change due to disease or other changes then the species is doomed to extinction.
A case in point is: Not everyone dies from a deadly disease. Some people or life forms have immunity or resistance due to a mutation.
You just waved my question away.
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