منابع مشابه
African Charter on Human and Peoples' Rights.
This Convention contains provisions relating to women's rights, pay equity, health, education, the family, the aged, freedom of movement, and asylum. Algeria ratified the Convention on 20 March 1987, Benin on 25 February 1986, Botswana on 22 July 1986, Burkina Faso on 21 September 1984, Cape Verde on 6 August 1987, Central African Republic on 27 July 1986, Chad on 11 November 1986, Comoros on 1...
متن کاملSex-ratio evolution in sex changing animals.
Sex allocation theory is often able to make clear predictions about when individuals should facultatively adjust their offspring sex ratio (proportion male) in response to local conditions, but not the consequences for the overall population sex ratio. A notable exception to this is in sex changing organisms, where theory predicts that: (1) organisms should have a sex ratio biased toward the "f...
متن کاملSex Ratio Elasticity Influences the Selection of Sex Ratio Strategy
There are three sex ratio strategies (SRS) in nature-male-biased sex ratio, female-biased sex ratio and, equal sex ratio. It was R. A. Fisher who first explained why most species in nature display a sex ratio of ½. Consequent SRS theories such as Hamilton's local mate competition (LMC) and Clark's local resource competition (LRC) separately explained the observed deviations from the seemingly u...
متن کاملCrowding, sex ratio and horn evolution in a South African beetle community.
Sexually selected ornaments and weapons are exceptionally variable, even between closely related species. It has long been recognized that some of this diversity can be explained by differences in mating systems between species, but there remains substantial variation between species with similar mating systems. We investigated the roles of sex ratio (measured as operational sex ratio, OSR) and...
متن کاملThe sex ratio in anencephaly.
A review of the data supports the suggestion of Knox (1974) that the sex ratio and incidence of anencephalics vary together within populations, as they are known to do between populations. There seems some doubts, though, whether Knox was correct in hypothesising that the sex ratio of anencephalics varies with their incidence in relation to the dizygotic twinning rate. The pattern of variation ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: American Anthropologist
سال: 1924
ISSN: 0002-7294
DOI: 10.1525/aa.1924.26.4.02a00030