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PopulationYou 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.
1. The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the or
X-ray Chest It is helpful in assessing heart size. One should look for presence of pericarditis, pulmonary oedema or pulmonary congestion. ECG One should look for pro
Management In case of small defects surgical treatment is not indicated because spontaneous closure may occur before one to two years of age. Patient is treated for conges
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Q. Concept of Development of binomial nomenclature? Name is a conventional tool to act as means of reference. For example, when we say chimpanzee, sparrow, paddy, virus, we mea
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Explain Post-lyme disease syndrome Some treated patients whose objective manifestations of Lyme disease have resolved with antibiotic treatment report subjective symptoms suc
To which heart chamber does the blood go after leaving the left atrium? What is the valve that separates these compartments? The arterial blood that has come from the lungs to
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