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Fitness is the end result of the ability...

Fitness is the end result of the ability to adapt and get selected by Nature. Explain with suitable example.

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Nature selects for fitness and this fitness is based on characteristics which are inherited. Hence there must be genetic basis for getting selected and to evolve, It means that some organisms are better adapted to survive in an otherwise hostile environment. This ability to adapt is invested and fitness is the end result of the ability to adapt and get selected by nature. Say .A. colony of bacteria is growing on given medium. It has variation in terms of ability to utilise a feed component A change to medium composition would bring out the part of population (say B)which can survive under differ conditions. Then in due course of time, this variant population out grows others as new species. Thus fitness of B is better in new conditions and nature selects for fitness.
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