Concepts and Measures of Population Doubling time is an expression of the number of years in which a given popualtionwould take to double itself. Biological Growth Human beings (as all living organisms) are biologically driven to reproduce. (Those individuals with the strongest sex drives, all thing being equal, are the most likely to produce offspring.) Cultural Growth Most human cultures place a positive value on reproduction. Western Christian ezample: Genesis Chapter 9vs. 1 & 2. "And God went on to bless Noah and his sons, and said unto them, 'Be frutiful, and multiply, and fill the earth'." Sex Ratio is the number of males in a population per each 100 females. The sex ratio is stated as one number of males/per 100 females. The Crude Birth Rate is an expression of the number of births per 1,000 persons in a given year. Births in A year X 1,000 = Crude Birth Rate Mid-year population The Crude Death Rate is an expression of the number of deaths per 1,000 persons in a given year. Deaths in A Year X 1,000 = Crude Death Rate.
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