Partnership status and the human sex ratio at birth
| Autor: | Karen Norberg |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Attractiveness
Population Ethnic group Human sex ratio Models Biological General Biochemistry Genetics and Molecular Biology 03 medical and health sciences 0504 sociology 5. Gender equality jel:I3 0502 economics and business Humans Sex Ratio 050207 economics education 030304 developmental biology General Environmental Science 0303 health sciences education.field_of_study General Immunology and Microbiology Marital Status 05 social sciences 050401 social sciences methods General Medicine United States jel:J1 Logistic Models Spouse Marital status General Agricultural and Biological Sciences Psychology Developed country Sex ratio Demography Research Article |
| Popis: | If two-parent care has different consequences for the reproductive success of sons and daughters, then natural selection may favour adjustment of the sex ratio at birth according to circumstances that forecast later family structure. In humans, this partnership-status hypothesis predicts fewer sons among extra-pair conceptions, but the rival 'attractiveness' hypothesis predicts more sons among extra-pair conceptions, and the 'fixed-phenotype' hypothesis predicts a constant probability of having a son, regardless of partnership status. In a sample of 86 436 human births pooled from five US population-based surveys, I found 51.5% male births reported by respondents who were living with a spouse or partner before the child's conception or birth, and 49.9% male births reported by respondents who were not (chi(2)=16.77 d.f.=1 p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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