Question

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What is Lamark's Theory? Explain.


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Answer 1

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${\tt {\underline{Jean \: Baptiste \: Lamarck}}}$ proposed that morphological changes occuring in living organisms are responsible for evolution and the reason behind these morphological changes is the laziness or activities of that organism. He called this concept as principle of 'use or disuse of organs'.

Further, he said that the neck of giraffe has become too long due to browsing on leaves of tall trees by extending their neck for several generations.

Similarly , Shoulders of the ironsmith have become very strong due to frequent hammering moments. Also, The wings of birds like Emu and Ostrich have become weaker due to no use.

All these examples are types of 'acquired characters' and are transferred from one generation to another generation.

This is called as the theory of inheritance of acquired characters or Lamarckism.

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Development of organs due to specific activities or their regeneration due to no use at all was widely accepted but transfer of those characters from generation to generation was rejected. Because many times , it had been verified that those modifications brought in us are not transferred to the next generation. Hence, thereby, Lamarck's theory was disapproved and rejected.

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Answer 2

Explanation:

Lamarck's Theory of Inheritance of Acquired Characteristics has been disproved. This was done in two major ways. ... The other way that Lamarck's theory has been proven wrong is the study of genetics. Darwin knew that traits are passed on, but he never understood how they are passed on.