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Parents who have this gene may be more likely to have a girl

Live Science
Summary
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Researchers analyzed the genomes of 450,000 males and females in the U.K. They found a gene variant that boosted a person's likelihood of having a daughter by 10% .

It's unclear whether the variant needs to be carried by mom, dad or both to influence this offspring-sex ratio.

The findings may bolster the idea that a classic evolutionary theory applies to people.