The family tree study showed that whether you're likely to have a boy or a girl is inherited, "says Gellatly."

他说：“谱系研究显示，你生小孩是男是女的可能性有多大，这是遗传的。”

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After sorting through 927 family trees from North America and Europe, including 556,387 people in all, Gellatly proposes another explanation.

盖里特利在对北美洲和欧洲927个族谱的556387人进行研究后做出了另一种解释。

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Gellatly hypothesizes that the gender-controlling gene comes in a "male" and "female" version , with three possible combinations of the two.

盖里特利假定，性别控制基因由“m”和“f”组成，它们有三种组合方式。

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