Intelligence Squared
How and Why did Sexual Reproduction Evolve on our Planet? With Dr Lixing Sun
Apr 02, 2026
· 39m
Before sex evolved on our planet, two billion years ago, all reproduction happened asexually. So why and how did sexual reproduction evolve? Dr Lixing Sun is Distinguished Research Professor in behavior and evolution at Central Washington University. In a new book, On the Origin of Sex, he explores the fascinating, varied and complex ways reproduction happens across the natural world: from whiptail lizards, capable of immaculate conception, to clownfish and bearded dragons who regularly switch gender roles. In this episode …
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