Neo-Darwinian evolution has presented a paradigm for population dynamics built on random mutations and selection with a clear separation of time-scales between single-cell mutation rates and the rate of reproduction. Laboratory experiments on evolving populations until now have concentrated on the fixation of beneficial mutations. Following the Darwinian paradigm, these experiments probed popul...

This paper is concerned with the connection between two classes of population variables: measures of population growth rate--the Malthusian parameter, the net reproduction rate, the gross reproduction rate, and the mean life expectancy; and measures of demographic heterogeneity--population entropy. It is shown that the entropy functions predict the response of the growth rate parameters to pert...

population in all countries plays a fundamental role in economic growth and economic development. but besides absolute size and growth rate of population, the more important factor will be “age structure” or “age distribution” of population, because it can be as source of many economical, social, and political challenges. in this research, we investigate effect of changes in population shares i...

India has diminishing population growth rates and fertility rates; however, they still remain high compared to the world average. The families living in poverty are those having the most children because they are consistently trapped in poverty from generation to generation with little opportunity. Poor families are typically larger because they use children as a source of generating income via...

Due to the high population growth rate in the mid-20th century, the government of Ghana introduced population policies to reduce the population growth rate. Encouraging girls’ education and increasing contraceptive use were the two main policy measures to reduce population growth. Subsequently, the total fertility rate (TFR) declined rapidly from 6.0 in 1985 to 4.3 in 2003. Using 2003 Ghana Dem...