This link has been bookmarked by 12 people . It was first bookmarked on 13 May 2008, by bennie berkeley.
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20 Nov 14
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03 Nov 14
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Demography is a social science which entails the statistical study of human populations.
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In population genetics a sexual population
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In ecology, the population of a certain species in a certain area is estimated using the Lincoln Index
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gamodeme . -
also known therefore as a gamodeme
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If the gamodeme is very large (theoretically, approaching infinity), and all gene alleles are uniformly distributed by the gametes within it, the gamodeme is said to be panmictic. Under this state, allele (gamete) frequencies can be converted to genotype (zygote) frequencies by expanding an appropriate quadratic equation, as shown by Sir Ronald Fisher in his establishment of quantitative genetics
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This seldom occurs in nature
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This may be viewed as the breaking up of a large sexual population(panmictic)into smaller overlapping sexual populations. This failure of panmixia leads to two important changes in overall population structure: (1).the component gamodemes vary (through gamete sampling) in their allele frequencies when compared with each other and with the theoretical panmictic original (this is known as dispersion, and its details can be estimated using expansion of an appropriate binomial equation); and (2). the level of homozygosity rises in the entire collection of gamodemes. The overall rise in homozygosity is quantified by the inbreeding coefficient (f or φ).
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30 May 14
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A population is a summation of all the organisms of the same group or species, who live in the same geographical area, and have the capability of interbreeding.
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02 Apr 13
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As of today's date, the world population is estimated by the United States Census Bureau to be 7.076 billion.
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In the future, world population has been expected to reach a peak of growth,[17] there it will decline due to economic reasons, health concerns, land exhaustion and environmental hazards. According to one report, it is very likely that the world's population will stop growing before the end of the 21st century. Further, there is some likelihood that population will actually decline before 2100.[18] Population has already declined in the last decade or two in Eastern Europe, the Baltics and in the Commonwealth of Independent States.[19]
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19 Sep 11
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08 Mar 11
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A population is all the organisms that both belong to the same species and live in the same geographical area. The area that is used to define the population is such that inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals from other areas. Normally breeding is substantially more common within the area than across the border
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A population is all the organisms that both belong to the same species and live in the same geographical area. The area that is used to define the population is such that inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals from other areas. Normally breeding is substantially more common within the area than across the border .
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The population pattern of less-developed regions of the world in recent years has been marked by gradually declining birth rates following an earlier sharp reduction in death rates.[11] This transition from high birth and death rates to low birth and death rates is often referred to as the demographic transition.[11]
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Human population control is the practice of artificially altering the rate of growth of a human population. Historically, human population control has been implemented by limiting the population's birth rate, usually by government mandate, and has been undertaken as a response to factors including high or increasing levels of poverty, environmental concerns, religious reasons, and overpopulation. While population control can involve measures that improve people's lives by giving them greater control of their reproduction, some programs have exposed them to exploitation.[12]
Worldwide, the population control movement was active throughout the 1960s and 1970s, driving many reproductive health and family planning programs. In the 1980s, tension grew between population control advocates and women's health activists who advanced women's reproductive rights as part of a human rights-based approach.[13] Growing opposition to the narrow population control focus led to a significant change in population control policies in the early 1990s.[
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19 Jan 09
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13 May 08
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