A Note on the Human Sex Ratio
نویسندگان
چکیده
منابع مشابه
A note on the sex ratio in anencephalus.
While exploring the association of the sex ratio of stillbirths with cause and duration of gestation, McKeown and Lowe (1951) noted that for anencephalus sex ratio increased with duration of gestation. No explanation was offered for this observation, which is here considered briefly. In Birmingham, during the years 1940-51, 454 stillbirths and 28 infant deaths were attributed to anencephalus (4...
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Investigations of secular changes in the live-birth sex ratios of different countries have given conflicting results (Gini, 1908; Russell, 1936; Ciocco, 1938; Strandskov, 1942; Martin, 1943). In general the data are unsatisfactory, either because numbers of births are small, or because of inaccuracies and deficiencies in birth notification. Russell (1936) examined statistics for England and Wal...
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In many, and perhaps indeed in the majority of diseases, one sex tends to be affected more often than the other, and the convulsive disorders of children appear to provide an example of such a differential sex incidence. Lennox, Gibbs, and Gibbs (1940) in a series of more than 2,000 cases, found that 57% of their affected patients were male and 43% female. Lennox (1949), in a series of over 150...
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A review of published reports showed that the sex ratio (proportion of boys) was low among infants conceived after ovulation had been induced. The difference between the observed sex ratio and an expected one of 0 . 514 was highly significant. These findings suggest that maternal gonadotrophin concentrations at the time of conception directly affect the sex of the zygote.
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The ratio of males to females in a population is known to influence the behaviour, life histories and demography of animals. A recent experimental study finds that sex ratio also affects human economic behaviour, and in a manner consistent with evolutionary theory.
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ژورنال
عنوان ژورنال: Proceedings of the National Academy of Sciences
سال: 1920
ISSN: 0027-8424,1091-6490
DOI: 10.1073/pnas.6.5.250