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Human sex ratio - Wikipedia, the free encyclopedia
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May 9, 2:32am
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•http://en.wikipedia.org/wiki/Human_se...
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In anthropology and demography, the human sex ratio is the sex ratio for Homo sapiens (i.e. the ratio of males to females in a population). Like most sexual species, the sex ratio is approximately 1:1. In humans the secondary sex ratio (i.e. at birth) is commonly assumed to be 105 boys to 100 girls (which sometimes is shortened to "a ratio of 105"). In human societies, however, sex ratios at birth or among infants may be considerably skewed by sex-selective abortion and infanticide. More data are 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.
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