Question

Describe the contribution of Lamarck.

Answer 1

Lamarck has left many legacies for future generations of biologists. His best known legacy was an explicit suggestion, developed in the Philosophie zoologique (PZ), that the effects of use and disuse (acquired characters) can be inherited and can drive species transformation. This suggestion was formulated as two laws, which we refer to as the law of biological plasticity and the law of phenotypic continuity. We put these laws in their historical context and distinguish between Lamarck’s key insights and later neo-Lamarckian interpretations of his ideas. We argue that Lamarck’s emphasis on the role played by the organization of living beings and his physiological model of reproduction are directly relevant to 21st-century concerns, and illustrate this by discussing intergenerational genomic continuity and cultural evolution. 

Answer 2

The theory proposed by J. B. Lamarck is known as the theory of inheritance of acquired characters. According to this theory, the use and disuse of an organ leads to acquiring of change in that organ. These changes or variations can be passed on from on generations to the next but this idea of inheritance of acquired characters was soon discarded.

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