Forces Shaping Human DNA Today

Some people are literally immune to HIV because of a genetic mutation. Their white blood

cells have a mutated CCR5 receptor that blocks the virus from entering. But here's the wild

part: this is just one of five forces constantly reshaping our DNA. Mutations create

new traits. Gene flow spreads them between populations. Non-random mating means we pick partners

based on looks and health. Genetic drift happens when disasters wipe out most of a population

or a few individuals start fresh somewhere new. And natural selection? It's the ultimate

filter, deciding which mutations stick around. These five agents are literally rewriting

the human gene pool right now as you watch this.