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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.
What type of compound is the major metabolic waste of Porifera? Why is it important for the organism to get rid of this compound?
Members belonging to the scientific community fear the misuse of this therapy leading to dangerous consequences. People may try to insert the desired gene, for example, the gene f
Q. Explain Spoilage of Cereals and Cereal Products? Cereals are the main source of energy to human beings. There are several varieties of cereals, of which wheat and rice are t
Define the Drug and Drug Effect? In the discussions above, we reviewed the effect of food on drug metabolism. Interestingly, not only can drugs interact with food and alcohol,
The life of a eukaryotic cell can be explained as a cell cycle. Mitosis and cell division happens in the M phase that lasts for only about 1 h. This is followed by the G1 phase whe
Q. What is the second polar body? After termination of the second meiotic division of the oocyte II two cells are generated: the second polar body and the egg cell proper. The
What is Gymnosperms explain its dividions? Gymnosperms are one of the two major groups of plants that bear seeds. The other group, the Angiosperms (flowering plants), differ in
Phenylketonuria is a severe form of mental disability caused by a homozygous recessive allele. The condition affects about 1 in 10,000 neborn Caucasians. Estimate the frequency of
Congenital Discrete Subvalver Stenosis : The abstraction could be fibrous or fibro muscular. It could be anywhere from just below the aortic cusps upto the level of the free edge
Vibriosis/campylobacteriosis This is genital disease of cattle and sheep. The causal organism Campylobacter fetus is a gram negative, curved or spiral shaped bacteria having s
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