Evolutionary Biology: Concepts and Theories Explained

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1. 28 July 2026 · corrected by Emir Baycan

   Corrected five genetics and paleoanthropology claims: qualified the very wide 30-70% flowering-plant polyploidization figure as varying across studies while affirming polyploidy as a major route to plant speciation; corrected the molecular-clock claim (it is not truly independent of generation time; substitution rates show a generation-time effect and clocks are calibrated and approximate); qualified the out-of-Africa expansion date to roughly 50,000-70,000 years ago with earlier smaller dispersals and ongoing debate; and, most importantly, corrected the outdated claim that African populations carry essentially no Neanderthal DNA and are ~100% Homo sapiens ancestry, noting that more recent analyses (Chen et al., 2020) found present-day Africans carry a small amount (on the order of 0.3%) of Neanderthal-derived DNA, partly from back-migration.

   What the page claimed

   The article stated a 30-70% polyploidization figure, a molecular clock independent of generation time and population size, a single settled 60,000-70,000-year out-of-Africa expansion, that African populations carry essentially no Neanderthal DNA, and that Africans have ~100% Homo sapiens ancestry.

   What was corrected

   Qualified the polyploidy, molecular-clock, and out-of-Africa claims, and updated the Neanderthal-DNA figures for African populations per the 2020 findings.

   Why: The Neanderthal-DNA claim was outdated (superseded by 2020 research) and the others were textbook simplifications. Corrections use the current primary literature rather than adding unverified sources.

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