Evolutionary Foundations

Nothing in biology makes sense except in the light of evolution.

-Theodosius Dobzhansky, The American Biology Teacher,

March 1973

Great progress in biochemistry and molecular biology during the decades since Dobzhansky made this striking generalization has amply confirmed its validity. The remarkable similarity of metabolic pathways and gene sequences in organisms across the phyla argues strongly that all modern organisms share a common evolutionary progenitor and were derived from it by a series of small changes (mutations), each of which conferred a selective advantage to some organism in some ecological niche.

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