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Question : What are the key concepts in the evolution theoryof Darwin? |
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Answer» Solution :The essence of Darwinian theory about evolution is Natural SELECTION. (i) RAPID multiplication : Microbes divide very fast. They multiply and become millions of individuals within hours. (ii) limited food and space: A colony of bacteria (say A) growing on a given medium has built in variations in terms of ability to utilize a feed component. (iii) STRUGGLE for existence : A change in the medium composition would bring out only thay part of the population (say B) which can survive under the new conditions. (iv) Variations: In due course of time this VARIANT population outgrows the others and appears as new species. (V) Survival ofthe fittest : Here we can say fitness of B is better than A under new conditions. (vi) Natural selection: Nature selects for fitness. Fitness is based on characteristics which are inherited. (vii) Speciation : Adaptive ability is inherited. It has genetic basis. Species get selected and evolved. Branching descent and natural selection are the two key concepts of Darwinian Theory of Evolution. |
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