In anthropology and demographythe human sex ratio is the ratio of males to females in a population. More data is available for humans than for any other species, and the human sex ratio is more studied than that of any other species, but interpreting these statistics can be difficult. Like most sexual species, the sex ratio in humans is approximately 1:
Fisher's principle is an explanation of why the sex ratio of most species is approximately 1:
Retrieved 19 May Sex-selective abortion and infanticide are thought to significantly skew the naturally occurring ratio in some populations, such as China, where the introduction of ultrasound scans in the late s has led to a birth sex ratio males to females of 1. The population stressors theory predicts that the East German sex ratio should have been lower in when East Germany's economy collapsed than expected from its previous years. All are entitled to equal protection against any discrimination in violation of this Declaration and against any incitement to such discrimination.
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The " First World " G7 members all have a gender ratio in the range of 0. Manuel Opens Their Asses 6. High birth sex ratios, some claim, may be caused in part by social factors.
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However, they report a significant effect of paternal age.