Question

write 1000 words on population

Answer 1

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.[1][2] The area that is used to define a sexual population is defined as the area where inter-breeding is potentially possible between any pair within the area, and where the probability of interbreeding is greater than the probability of cross-breeding with individuals from other areas.[3]

In sociology, population refers to a collection of humans. Demography is a social science which entails the statistical study of human populations.

This article refers mainly to human population.

Population genetics (ecology)Edit

In population genetics a sexual 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.[4] If the Gamo deme is very large (theoretically, approaching infinity), and all gene alleles are uniformly distributed by the gametes within it, the Gamo deme 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.[5]

This seldom occurs in nature: localization of gamete exchange – through dispersal limitations, preferential mating, cataclysm, or other cause – may lead to small actual Gamo demes which exchange gametes reasonably uniformly within themselves but are virtually separated from their neighboring Gamo demes. 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 panmixialeads to two important changes in overall population structure: (1) the component Gamo demos 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 Gamo demes. The overall rise in homozygosity is quantified by the inbreeding coefficient (f or φ). 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. 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). It can be shown that dispersion-assisted selection leads to the greatest genetic advance (ΔG=change in the phenotypic mean), and is much more powerful than selection acting without attendant dispersion. This is so for both allogamous (random fertilization)[6] and autogamous (self-fertilization) Gamo demes.[7]

In ecology, the population of a certain species in a certain area can be estimated using the Lincoln Index.

World human populationEdit

Main article: World population

As of today's date, the world's population is estimated by the United States Census Bureau to be 7.583 billion.[8] The US Census Bureau estimates the 7 billion number was surpassed on 12 March 2012. According to a separate estimate by the United Nations, Earth’s population exceeded seven billion in October 2011, a milestone that offers unprecedented challenges and opportunities to all of humanity, according to UNFPA, the United Nations Population Fund.[9]

According to papers published by the United States Census Bureau, the world population hit 6.5 billion on 24 February 2006. The United Nations Population Fund designated 12 October 1999 as the approximate day on which world population reached 6 billion. This was about 12 years after world population reached 5 billion in 1987, and 6 years after world population reached 5.5 billion in 1993. The population of countries such as Nigeria, is not even known to the nearest million,[10] so there is a considerable margin of error in such estimates.[11]

Researcher Carl Haub calculated that a total of over 100 billion people have probably been born in the last 2000 years.[12]

Answer 2

HELLO FRND.
__________

POPULATION
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IN BIOLOGY, THE COLLECTION OF INTERGENERATIONAL BREEDING OF SPECIAL SPECIES IS CALLED POPULATION;

IN SOCIOLOGY, IT IS CALLED THE COLLECTION OF HUMANS.


Every person coming within the population shares some aspects,

which may be statistically different,

but if generally, these differences are so unclear
that no determination can be made on their basis.

The whole number of people or residents in a country or region

capturing an area of ​​individuals or creating a whole

Total of particles at a special energy level - especially the use of atoms in a laser

Process of Population or Process.

A group of individuals or individuals that have quality or specialty in common

Creatures living in a particular area (2): A group of interbriding organisms that represent the level organization on which species start

A group of individual individuals, objects, or objects in which sample is taken for statistical measurement.


_________

THANK YOU

@SRK6