the.com/population genetics

means The branch of biology that uses mathematical models to track how gene frequencies shift within populations over generations, driven by mutation, selection, drift, and migration.

from A 20th-century fusion phrase: 'population' from Latin populus ('people'), and 'genetics' coined in the early 1900s from Greek genesis ('origin, birth'). The field itself was forged when biologists realized Mendel's tidy inheritance rules needed to be rephrased as statistics to describe whole breeding populations rather than single pea plants — a synthesis built largely by early-to-mid 20th-century mathematical biologists who translated Darwin's evolution into equations.