Drift

Genetic Drift

One of the conditions of the Hardy-Weinberg equilibrium (the set of circumstances under which evolution does not occur) is that the population of breeding individuals is large enough that chance will not alter the allele frequency from one generation to another. When the population is small, however, all but one allele of each gene tends

Continental Drift

Dating back to the early history of science, it was long thought that Earth was a static, stable planet whose surface remained largely unchanged through time. This view radically changed during the 1960s, as an array of improved analytical techniques and an influx of new observations revealed that Earth’s surface is in a state of

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