Biology / Bio 1783 · Atom · ~20 seconds
Selection's Limits: No Perfect Organism, Not All Evolution Adaptive
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Selection acts only on existing variation and cannot produce a perfect organism; other forces, especially drift per Bio 1757, can change fit without improving.
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Genes close together on a chromosome are inherited together, so a beneficial allele can drag along a harmful linked allele.
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Evolution has no goal — several forces change allele frequencies, and only natural selection consistently produces adaptation.