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Briefly discuss Lamarckian Theory of Inheritance, citing an appropriate example.


Solution

Lamarck was the first scientist who attempted to explain evolution through the theory proposed by him calledLamarck's Theory of Evolution/ Theory of inheritance of acquired characteristics or Use and disuse theory.
According to Lamarck, new needs due to environmental changes cause the development and accumulation of acquired traits in a number of generations. The accumulation of acquired characters of a number of previous generations causes the speciation.
He also postulated that the use of organ strengthens it while the disuse weakens it and subsequently the organ loses its functionality as a result of this. According to Lamarck, the long neck of a giraffe evolved because its ancestors lengthened their necks by stretching them to obtain food and this change was passed to their subsequent generations.

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