Sex ratio data
A New Hypothesis Based on Preconception Environment and Evidence From a Large Sample of Twins".
Latitude, with countries near the equator producing more females than near the poles."A story of drinkers, genocide and unborn girls".Place, total population, male population, female population, sex ratio Fort Lauderdale, FL 165,521 87,387 78,134 111.8 Tempe, cleaning lady looking for fribourg AZ 161,719 84,200 77,519 108.6 Wichita Falls, TX 104,553 54,172 50,381 107.5 Norfolk, VA 242,803 125,797 117,006 107.5 Paradise CDP, NV 223,167 115,508 107,659 107.3 Columbia, SC 129,272.17 Even in the absence of sex selection practices, a range of "normal" sex ratios at birth of between 103 and 108 boys per 100 girls has been observed in different economically developed countries, 18 and among different ethnic and racial groups within a given.38 39 Other pollutants such as PCBs can cause an increase in the male ratio.Advertising, results in context use the software and data from.
30 However, as noted in the Social factors section below, it is important to exclude alternative explanations, including social ones, when examining large human populations whose composition by ethnicity and race may be changing.
Mills JL, England L, Granath F, Cnattingius S (May 2003).
Behavioral Ecology and Sociobiology.Ellis L, Bonin S (2002).Mendl M, Zanella AJ, Broom DM, Whittemore CT (1995).White births (which account for over 80) continued to show a statistically significant decline, while other racial groups showed non-statistically significant declines (Japanese, Native American, other little or no change (black or an increase (Chinese).Environmental factors edit Effects of climate change edit Various scientists have examined the question whether human birth sex ratios have historically been affected by environmental stressors such as climate change and global warming."Pollution makes for more girls".In the evolutionary biology of sexual reproduction, the operational sex ratio (OSR is the ratio of sexually competing males that are ready to mate to sexually competing females that are ready to mate, or alternatively the local ratio of fertilizable females to sexually active males.
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