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Marissa is a freelance science journalist in Bozeman, Montana. Researchers at Michigan State University and other institutions found that among 72 mothers in rural Kenya, women with sons generally gave richer milk 2. The imbalance should be greatest in polygamous societies, in which men can father offspring with multiple wives, such as the Kenyan villages. Together the studies provide support for a year-old theory in evolutionary biology. Their recalculated figure was 1. In those societies, a son can grow to be a strong, popular male with many wives and children, or he can end up with neither. Well-off parents who can afford to invest in sons should do so because their gamble could give them many grandchildren.

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The Trivers-Willard hypothesis states that natural selection favors parental investment in daughters when times are hard and in sons when times are easy.

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Boys and Girls May Get Different Breast Milk

Even beyond fat and protein, other milk components might vary in humans, says Katie Hinde, an assistant professor in human evolutionary biology at Harvard University. The imbalance should be greatest in polygamous societies, in which men can father offspring with multiple wives, such as the Kenyan villages. Follow on Twitter marisfessenden. Marissa is a freelance science journalist in Bozeman, Montana. Conversely, poor parents should not heavily invest in sons because it is unlikely to pay off—their offspring start at the bottom of the socioeconomic ladder. Marissa Fessenden Marissa is a freelance science journalist in Bozeman, Montana. In those societies, a son can grow to be a strong, popular male with many wives and children, or he can end up with neither.

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