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Quanta Magazine ·For the curious

How Virus-like ‘Jumping Genes’ Became Our Partners in Evolution

by Jake Buehler

Published 2026-09-21 14:12:36+00:00

How much of evolution is driven by genes that refuse to stay put?

0:00 / 12:29 · Narrator Vindemiatrix

Context

For decades, biology treated the wandering genetic fragments that make up nearly half the human genome as simple parasites or junk. But in a piece published on 21 September 2026, Quanta Magazine captures a quiet shift in how geneticists understand these jumping genes. The central question is no longer how these sequences disrupt DNA, but whether they actually drive evolution. The story blurs the boundary between host and infection, leaving the reader with a strange thought: what if the invaders inside a cell are the very things building it?

Show notes

An overview of transposons, the mobile fragments of DNA that can cut, copy, and paste themselves across a genome. While long dismissed as viral parasites or junk DNA, these jumping genes are now understood to drive biological adaptation. Outlines how they operate and their role in generating new traits, from the dark wings of peppered moths to the placenta in mammals.

Read on Quanta Magazine →