Humans at tropical latitudes produce more females.

Abstract

Skews in the human sex ratio at birth have captivated scientists for over a century. The accepted average human natal sex ratio is slightly male biased, at 106 males per 100 females or 51.5 per cent males. Studies conducted on a localized scale show that sex ratios deviate from this average in response to a staggering number of social, economical and… (More)
DOI: 10.1098/rsbl.2009.0069

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