A massive study of over 58,000 women shows that families may have their own subtle biological bias toward having boys or girls, rather than offspring sex being purely random. Researchers found that older maternal age at first birth and specific maternal genetic variants were linked to having only sons or only daughters.
A massive study of over 58,000 women shows that families may have their own subtle biological bias toward having boys or girls, rather than offspring sex being purely random. Researchers found that older maternal age at first birth and specific maternal genetic variants were linked to having only sons or only daughters.
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