The genetics of sex-ratio variation have important implications for the evolution of the sex ratio for two reasons. First, additive genetic variance is required for the evolution of any trait, ...

Ray and colleagues1 present data on variation in birth sex ratios among Ontario newborns, showing a significant male-biased sex ratio at birth among multiparous Indian and South Korean mothers. The ...

A study finds natural variation in baseline sex ratios at birth and evidence of sex ratio inflation in 12 countries. Prevalence of sex-selective abortion in some countries can skew the sex ratio at ...

An international team of researchers, led by UMass Amherst biostatistician Leontine Alkema and her former Ph.D. student Fengqing Chao, developed a new estimation method for assessing natural ...

This is a preview. Log in through your library . Abstract Factors affecting relative investments in male and female offspring may be conveniently investigated in xylophilous aculeate Hymenoptera.