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遗传学告诉我们，生男生女本质上是一次随机事件——卵子只带X染色体，精子带X或Y的概率接近1:1，谁结合谁说了算。然而，哈佛大学连发两篇重磅研究，狠狠挑战了“随机五五开”的传统观点。研究发现：母亲孕前的压力状态、生育年龄，甚至是自身的基因，都在悄悄影响着后代的性别。
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