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When you talk about sibling issues, everyone takes it personally. What I want to talk about today are sibling sex ratios — having a sibling of the other sex versus growing up in all-boy or all-girl sibling configurations. The evolutionary theory, which has been advanced to explain sex ratio, goes back to Darwin, but was fully formulated in by a British scientist named Ronald Fisher, who made the argument that if individuals vary in the sex ratio among their offspring that is, some are more likely to produce more males or more females , the reproductive advantage in a population will always lie with the rarer sex, and thus the sex ratio will equilibrate toward After all, Fisher argued, half of the genetic material of the next generation must come by way of those who tend to produce males, and half from those who tend to produce females. But are there such tendencies? Zietsch wrote. McHale, a professor at Penn State University whose research focuses on siblings. Although there are not many studies of siblings in later life, she said, those that we have show that people who have closer relationships with their siblings are healthier in older age. The research shows, she said, that parents tend to spend relatively more time with a child of the same sex as the parent — but that when parents have children of both sexes, the discrepancy shrinks, at least in the U. McHale said.
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