Why More Boys than Girls—Or More Girls than Boys?: New Findings on Human Sex Ratio Variation at Birth

John Martin, Professor Emeritus, Department of Anthropology, Arizona State University and Visiting Research Associate; and Paul Wren, Senior Principle Engineer, Performance Software Corporation, Phoenix, AZ, and Co-Founder and Administrator of Open Anthropology Cooperative

Colloquium, SAR Boardroom

Wednesday, February 15, 2012, 12:00–1:00 pm, Free

John MartinJohn Martin2011–2012 Visiting Research AssociateJohn Martin2011–2012 Visiting Research Associate

Why is the ratio of male to female births among women who do not live with other women of fertile age higher than it is with women who do? This presentation looks at new findings from analyses of the complex interactions among maternal age, maternal residence, and number of previous births associated with sex ratio variations in southern Africa. Findings illuminate the bio/social variables that affect the sex of offspring.

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