Biology · Evolution
Contemporary developments like epigenetics and horizontal gene transfer are framed as 'refinements and expansions' of Darwinism, rather than direct refutations. This distinction primarily rests on the idea that these newer concepts:
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- 1Primarily describe non-heritable environmental modifications, which, by definition, cannot contribute to the genetic basis of natural selection.
- 2Contradict the gradual, stepwise nature of evolutionary change as initially proposed by Darwin, thereby requiring a paradigm shift in understanding.
- 3Offer alternative mechanisms for generating variation and influencing adaptation, but these processes ultimately remain subject to the overarching force of natural selection across generations.✓
- 4Are exclusively observed in single-celled organisms, thus having limited implications for the evolutionary trajectory of multicellular life.
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Offer alternative mechanisms for generating variation and influencing adaptation, but these processes ultimately remain subject to the overarching force of natural selection across generations.
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