How Genetic Drift Changes Populations Over Time

Chance as an Evolutionary Force: Genetic drift happens when random events—not natural selection—change which genes get passed on.
Small Populations, Big Impact: In tiny groups, random DNA shifts can dramatically alter a species’ genetic makeup over time.
Evolution by Coin Flip: Sometimes survival or reproduction is just luck—those lucky genes spread, others disappear.
When Genes Go Missing: Even useful traits can vanish through chance alone, showing that evolution isn’t always predictable.
The Founder Effect: When a few individuals start a new population, their limited genes shape all future generations.
The Bottleneck Effect: After disasters or population crashes, only a few survivors pass on their genes—reducing diversity.
Randomness with Consequences: Genetic drift doesn’t follow a plan, but its random changes can steer evolution in surprising directions.
Drift vs. Selection: While natural selection favors advantage, drift runs on luck—both together shape life’s story.
Lost Diversity, New Paths: When variation shrinks, evolution’s options narrow—but sometimes, drift leads to unexpected adaptations.
The Subtle Sculptor of Evolution: Over generations, genetic drift quietly reshapes populations—proof that chance plays a powerful role in life’s evolution.