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Can evolution go backwards?

Tiny Matters

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In 1893, Belgian paleontologist Louis Dollo suggested that evolution can’t go backwards in the exact same way that it proceeded. This became known as “Dollo’s Law,” and came under a lot of scrutiny. But, more recently, Dollo’s Law was co-opted into the idea that traits, once they gain a certain amount of complexity, can’t return to a simpler state. In this episode of Tiny Matters, we explore two exciting examples where scientists have found that not to be the case.

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Chapters

1. Can evolution go backwards? (00:00:00)

2. Dollo's Law (00:00:01)

3. Can complex structures revert back to a simpler form? (00:02:47)

4. Fern reproductive evolution (00:04:32)

5. Engineering bacteria to go 'backwards' (00:12:11)

6. Tiny show and tell: Contagious urination (00:24:09)

125 episodes