No Evidence of Genetic Basis to Variation in Human Offspring Sex Ratio.

Abstract excerpt

Fisher's principle proposes that the population sex ratio remains approximately equal (around 1:1) through a process of negative frequency-dependent selection. However, large-scale studies show that human offspring sex ratio (OSR) is not heritable in humans, raising doubts about whether Fisher's principle is a valid explanatory framework for human OSR evolution. Song and Zhang recently proposed a mechanism where...

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