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

Explanation

The essence of Darwinian theory about evolution is natural selection. Fitness is the end result of the ability to adapt and get selected by nature Example. A colony of bacteria (Say A) growing on a given medium has built in variation in terms of ability to utilise a feed component. A change in the medium composition would bring out only that part of population (Say B) that can survive under the new conditions. In due course of time the variant population outgrows the others and appears as new species. Here we say that fitness of Bis better than that of Under the new conditions Nature selects for fitness, and this fitness is based on characteristics which are inherited. Some organisms are better adapted to survive in an otherwise hostile environment and these get selected by nature over the others.