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Why Drift Is the Default Explanation for an Allele Frequency Difference

This is terminal understanding 6 of the path stated as a reasoning habit. Every demographic mechanism above produces frequency differences for free, so the burden of proof sits on any functional story, not on the null.

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Why is drift the default explanation for a frequency difference between populations?

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PDF Neutral Theory

The page explains why random genetic drift, not selection, is the default account of molecular change: in a finite population allele frequencies wander by sampling alone, a new neutral mutation fixes…