Humans have roughly the same number of male and female babies, but there may be variation between families. A new genetic analysis of huge human populations explores the reasons why
Articles on Sex ratios
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Assuming that natural selection shapes all animal and plant traits is a false impression. Natural selection is a mindless process.
The sexual selection of larger males may be driven by an abundance – not a scarcity – of females.
A little bit of statistics can explain the great mystery of why only girls are being born in Miejsce Odrzanskie.
China’s surplus of unmarriageable men poses a stark dilemma for Xi and other leaders as they set the country’s economic course for the next five years.
Involuntary bachelors, who fail to add fruit to their family tree are often referred to as “bare branches”. And the Chinese state has recently started to worry about them.
New research explains why habitat loss means male willow warblers now outnumber females – and that’s bad news for the species.
The risk of harm in sex selection stems from the fact that parents don’t desire any child, they want a child of a particular sex, who is to remain within the limits of binary gender roles.
Top contributors
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Professor of Applied Ecology, University of East Anglia
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Senior Researcher in Biological Sciences, University of East Anglia
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Assistant Professor of Psychology, NYU Shanghai
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Research Associate, Ludwig Maximilian University of Munich
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Professor of Political Science, Drake University
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Professor of Biodiversity at The Milner Centre for Evolution, University of Bath
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Emeritus Professor, University of Pretoria
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Professor in Genetics, University of Pretoria
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Senior Lecturer in Statistics, University of Glasgow
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Distinguished Professor, Centre for Conservation and Ecology Genetics, University of Canberra
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Jenny Graves is a Friend of The Conversation.
Distinguished Professor of Genetics and Vice Chancellor's Fellow, La Trobe University