Population, Biology

Population

You must be familiar with the term 'population'. It is one of the most talked about issues of this century. It is feared that the rapid growth of the world population if allowed to continue, might outstrip the food supply in the near future. The present high rate of population growth is a major concern of the governments, scientists and administrators. Have you ever wondered as to what is meant by population?

In a technical sense 'population' is defured as a group of freely interbreeding the same species present in a specific area at a given time. For example, when we say thatindividuals of the population of a city is 50,000, we mean that there are 50,000 individuals of Homo sapiens in that town. Other living organisms, for example cats and dogs present in the city are not included as they are populations of two different species.

In nature, population of a species is subdivided into a number of local breeding populations called deme. Demes are geographically separated populations of the same species. For example, the garden lizards of Qutub Minar. Delhi, form a separate deme from the garden lizard of Lodi Gardens, Delhi or the garden lizards of Swaraj Bhawan, Allahabad.

Consequently, in a deme each individual has an equal opportunity of mating with another individual of the opposite sex, but not with individuals in another deme. Because of frequent mating and similar environmental conditions members of a deme resemble each other more closely.

A population exhibits certain characteristics which can only be expressed at the population level and not shared by the individuals of the population. For example, individual organisms are born, grow and die but characteristics such as birth rate, death rate, density are only meaningful at the population level.

Posted Date: 12/10/2012 4:33:40 AM | Location : United States







Related Discussions:- Population, Assignment Help, Ask Question on Population, Get Answer, Expert's Help, Population Discussions

Write discussion on Population
Your posts are moderated
Related Questions
Define two basic principles of food processing? The fundamentals of food processing, as you may recall, involves the following two basic principles: Prepare the products

Describe in brief about failing implant The failing implant may show evidence of pocketing, bleeding upon probing, purulence, and indicates the bone loss patterns are progressi

Define Procedure for Gram Staining of Bacterial Cultures? Now carry out the exercise following the steps enumerated herewith: 1. Label the nutrient agar plates with the name

There  are a broad  range  of various  process  for cloning  DNA  into  either viral  or plasmid vectors  but the basic  scheme  of events  is frequently  same.  To clone into a pl

Autumn (fall) overturn In autumn or early winter the air temperature falls, resulting in the cooling of the surface waters. When the surface water cools to 4°C it becomes dens

Determine some Beneficial effects of phytates? Some of the health promotive aspects of phytates include: 1) Phytic acid is a known antioxidant. Colonic bacteria produce oxyg

Ask queson #Minimum 100 words accepted#sources of fuel which do not depend on fossil fuel

What colors of light are needed in a grow light for strawberry development?

Synthesis of fatty acids requires the movement of citrate out of the mitochondria. This occurs under conditions of high levels of acetyl CoA which is needed to stimulate the activi

Q. Therapeutic dose of pyridoxine? Therapeutic dose of pyridoxine (lg/day) is usually tried in all patients with hypermethioninernia and homocystinemia. For patients who do not