Key differences, features, and comparative analysis of Lamarck and de Vries (Mutation theory).
| Lamarck | de Vries (Mutation theory) |
|---|---|
| Inheritance of acquired characters via use and disuse of organs. | Evolution driven by mutations (large, sudden changes = saltation). |
| Example: giraffe's long neck from stretching to reach leaves. | Based on the evening primrose, Oenothera lamarckiana. |
| Now discredited (acquired traits are not inherited). | Variation is random and directionless — unlike Darwin's small, directional variations. |
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