Introduction and size of population

The number of children, young boys and girls adult and old men and women denotes the population of a particular place in a particular time. The total number of people living in a particular place is called population. The number of people living in 75 districts of Nepal is about 24 million. Population is defined as the organization of people who are living their life with respect to socio-economic, racial and cultural background. The population has a life history in that is grows and maintain itself. It has rate, death rate and age ratio. Thus, an individual is born and dies and has age. Individual of the population breed among themselves. Effective population size may be defined in two ways, variance effective size and inbreeding effective size. Population size varies over time. Suppose there are t non-overlapping generations, then effective population size is given by the harmonic mean of the population sizes. The developing countries have been suffering from the problems arising from population explosion.