The evolution of human sex ratio at birth: a bio-cultural analysis

The Evolution of Cultural Diversity: A Phylogenetic Approach • UCL Press • London, UK • Published In • Pages: 207-216 •
By Mace, Ruth, Jordan, Fiona M.

Abstract

What explains global variation in sex ratio at birth? To address this question, the authors present the results of their previous research on sex ratio at birth (2003), and additionally introduce new research on the correlations between sex ratio and marriage costs, such as a dowry or brideprice. Using a phylogenetic approach, the authors find that there is no correlation between sex ratio at birth and marriage payments. Analysis is restricted to the Old World.

Samples

Sample Used Coded Data Comment
Ethnographic Atlas (EA)Other researchersUsed to identify cultures that give dowry or brideprice in the Old Word.
CIA World FactbookOther researchersData on sex ratio at birth drawn from CIA World Factbook for countries in the Old World.
Cavalli-Sforza et al. (1994) worldwide genetic treeOther researchersAuthors selected Old World countries then matched the major ethnic groups to those on the genetic tree.

Hypotheses (6)

HypothesisSupported
Sex ratio at birth will be positively correlated with the presence of brideprice.Not Supported
Sex ratio in children between 0-14 years old will be positively correlated with the presence of brideprice.Not Supported
Sex ratio in adults between 15-65 years old will be positively correlated with the presence of brideprice.Supported
Sex ratio at birth will be negatively correlated with the presence of dowry.Not Supported
Sex ratio in children between 0-14 years old will be negatively correlated with the presence of dowry.Not Supported
Sex ratio in adults between 15-65 years old will be negatively correlated with the presence of dowry.Not Supported
Documents and Hypotheses Filed By: isanaraja