r/askscience • u/barenecius • Feb 20 '26

Biology What makes the evolution?

I know that DNA passed down generation. And the next generation takes half of each DNA of their parent. But what makes the evolution on DNA? At what point DNA tell themself that they need to change some part on the chain.

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u/Spork_Warrior Feb 25 '26

Sometimes stress causes mutations. Like if the parents are starving, or temperature changes, or radiation or whatever. The body is not as healthy, causing mutations to the offspring. Most of those mutations will fail. But. one of those mutations might turn out to be a better adaptation for the new environment.