Lamarckism and Neo-Lamarckism: Major differences
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Lamarckism
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Neo-Lamarckism
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1. It is the original theory proposed
by Lamarck
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It is the modified form of Lamarckism based on modern knowledge
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2. It says about some internal forces,
changes in environmental factors and use and disuse of organs.
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It says about changes in environmental factors but not due to use and
disuse of organs and internal forces.
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3. Only somatic cells are affected so
acquired characters are developed during individuals own life span.
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Somatic cells and germ cells are affected.
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4. Acquired characters are inheritable.
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Only germinal variations are inheritable or where germ cells are formed
from somatic cells.
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