Neanderthals Did Not Disappear: They Still Live in Modern Human Genes

Around 40,000 years ago, Neanderthal traces declined sharply across Europe and western Asia. Textbooks turned that event into one clean sentence: Homo sapiens arrived, Neanderthals lost, and the species became extinct. DNA makes that story impossible to keep in its simple form. People with ancestry outside Africa usually carry about 1-4% Neanderthal DNA. Some populations also carry Denisovan DNA, from an ancient group first identified from only a few bones and teeth.

Ancient DNA from Neanderthal bones and teeth can be placed beside the genomes of living people. The shared pieces are not merely genes inherited from a very distant common ancestor. They appear as longer segments passed through generations, showing that Homo sapiens and Neanderthals met, had children, and left descendants who could reproduce. If a population has living descendants carrying its genes, the word “erased” has hidden the most important part of the story.