World Population Prospects: The Revision, Key Findings and Advance According to the results of the Revision, the world's population numbered. According to the results of the Revision, the world's population numbered nearly billion as of mid, implying that the world has added. state of world population THE POWER OF. CHOICE. REPRODUCTIVE RIGHTS AND THE DEMOGRAPHIC TRANSITION state of w orld population .
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UN Population Division, Department of Economic and Social. Affairs, with support from the UN Population Fund (UNFPA). World Population Plan of Action. 28% under age • 32% under age 15 excluding China. • 40% under age 15 in least developed countries. • 6% greater than age • 5% greater than age As of February , the total population of the world exceeds billion people , and this number is continuing to grow each day. However, in some areas.
In biology, a population is all the organisms of the same group or species , which live in a particular geographical area , and have the capability of interbreeding. In sociology , population refers to a collection of humans.
Demography is a social science which entails the statistical study of human populations. Population in simpler terms is the number of people in a city or town, region, country or world; population is usually determined by a process called census a process of collecting, analyzing, compiling and publishing data. In population genetics a sex population is a set of organisms in which any pair of members can breed together.
This means that they can regularly exchange gametes to produce normally-fertile offspring, and such a breeding group is also known therefore as a Gamo deme. This also implies that all members belong to the same species.
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. This seldom occurs in Nature: However, there may be low frequencies of exchange with these neighbors. 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: Note that all homozygotes are increased in frequency — both the deleterious and the desirable.
The mean phenotype of the Gamo demes collection is lower than that of the panmictic original — which is known as inbreeding depression.
World Population Problems
It is most important to note, however, that some dispersion lines will be superior to the panmictic original, while some will be about the same, and some will be inferior. The probabilities of each can be estimated from those binomial equations.
In plant and animal breeding , procedures have been developed which deliberately utilize the effects of dispersion such as line breeding, pure-line breeding, backcrossing. This is so for both allogamous random fertilization  and autogamous self-fertilization Gamo demes. In ecology, the population of a certain species in a certain area can be estimated using the Lincoln Index. According to the United States Census Bureau the world's population was about 7.
2018 World Population Data Sheet With Focus on Changing Age Structures
According to papers published by the United States Census Bureau, the world population hit 6. The United Nations Population Fund designated 12 October as the approximate day on which world population reached 6 billion. This was about 12 years after world population reached 5 billion in , and 6 years after world population reached 5. The population of countries such as Nigeria , is not even known to the nearest million,  so there is a considerable margin of error in such estimates.
Researcher Carl Haub calculated that a total of over billion people have probably been born in the last years.
Population growth increased significantly as the Industrial Revolution gathered pace from onwards. In the future, the world's population is expected to peak,  after which 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 The population pattern of less-developed regions of the world in recent years has been marked by gradually increasing birth rates.
These followed an earlier sharp reduction in death rates.
Human population control is the practice of altering the rate of growth of a human population. Historically, human population control has been implemented with the goal of increasing the rate of population growth.
In the period from the s to the s, concerns about global population growth and its increasing effects on poverty, environmental degradation , and political stability led to efforts to reduce population growth rates.
While population control can involve measures that improve people's lives by giving them greater control of their reproduction, a few programs, most notably the Chinese government's one-child per family policy, have resorted to coercive measures. To control of population structure,it measures through efficient mixed-model association EMMA method, which corrects for population structure and genetic relatedness in model organism association mapping.
In the s, stress increased between population control advocates and women's health activists who advanced women's reproductive rights as part of a human rights -based approach. From Wikipedia, the free encyclopedia.
All the organisms of a given species that live in the specified region. For other uses, see Population disambiguation. Main article: World population. Population growth.
Human population control. Biology Online. Retrieved 5 December Oxford Dictionaries.
Oxford University Press. Demographic transition is the long-term shift in birth and death rates from high to low levels in a population. The mortality decline usually precedes the fertility decline, resulting in rapid population growth during the transition period. The demographic transition refers to the long-term change that populations undergo from high to low rates of births and deaths.
It can be broadly divided into three phases. The first phase is characterized by declining mortality but continued high fertility, leading to rapid population growth and increases in the share of children in the population.
Many countries in sub-Saharan Africa, such as Niger, Tanzania, and Democratic Republic of Congo, are in this first phase of transition.
The second phase is characterized by declining fertility and further declines in mortality. As smaller birth cohorts replace larger ones and larger birth cohorts age into adulthood, the share of children in the population begins to decline while the share of working-age adults grows.
The third phase is characterized by low levels of both fertility and mortality, where the share of child and working-age populations declines and the share of older adults increases. Japan and most countries in Europe are in this final phase of the transition. The timing and speed of these age structure changes have important social and economic implications. Each Population Age Structure Presents Different Challenges Population age structure has implications for national policy agendas and resource allocation.Therefore, specific statistics and racial demographics of the world population as a whole are difficult to find as countries have not found a way to consolidate their findings or compromised in measuring the same single indicator of race.
The mortality decline usually precedes the fertility decline, resulting in rapid population growth during the transition period.
As smaller birth cohorts replace larger ones and larger birth cohorts age into adulthood, the share of children in the population begins to decline while the share of working-age adults grows. Age at first marriage Divorce rate Ethnic and cultural diversity level Immigrant population Linguistic diversity Median age Age structure Dependency ratio Net migration rate Number of households Sex ratio Urban population Urbanization.
Vatican City is predicted to continue being the least populated country in the world in In sociology , population refers to a collection of humans.
Year Population Annual Growth Rate 7,,, 1. Schematic presentation of birth and death rates in less-developed countries, midth century.
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