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The uneven playing field for boys starts early. The Y chromosome tends to develop mutations more often than X chromosomes and the lack of a second X chromosome in men means that X-linked abnormalities among boys are not ?masked? by a second, normal version. Survival in the womb is also less reliable for male fetuses (for uncertain, and probably multiple, reasons). Developmental disorders are also more common among boys; some of these could shorten life expectancy.
P.S: Even i don`t wtf did i just wrote.hahah
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