About this episode
38亿年前，地球上的第一批生命，连"性别"这个概念都没有——它们只是简单地一分为二。
直到某一天，两个细胞决定不再复制自己，而是交换基因。这场豪赌，成了生命演化史上最重要的实验之一。从此，生命有了雄与雌，有了X与Y，有了你我。为什么演化要"发明"性别？这多出来的另一半，到底值不值？本期尹哥聊基因，带你回到38亿年前，看一场写进你身体里的演化实验。用最硬核的生命科学，讲最温暖的人间故事。
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