The Balance of the Sexes
Why do women in war time and Presidents of the United States have more sons than daughters? Scientists are looking to animals to provide us with answers.

Dr Valerie Grant at the University of Auckland thinks that female dominance in personality is the crucial factor. She has found that more dominant women are more likely to have sons and that less dominant women are more likely to have daughters. Andrew Luck-Baker attempts to untangle the mysteries of sex ratios and discovers which part of our biology, environment and maybe even personality plays a part in deciding the sex of offspring.

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