Fig. 1From: Witnessing Phenotypic and Molecular Evolution in the Fruit FlyWhen an advantageous mutation occurs, it rises to high frequency, dragging along nearby neutral variants. Eventually, every individual in the population has the same mutation and the nearby neutral variants that “hitchhiked” with it. All previous diversity is lost. Conversely, neutral variants located far away from the advantageous mutation do not hitchhike because recombination can break apart the association and therefore maintain variationBack to article page