In normal populations the frequencies of alleles are constantly changing and are not considered to be in equilibrium at any one time. Any factor that disrupts the fine balance of alleles at any one time can cause variations in the predicted population in later generations.
We use the term gene pool to describe the sum of all of alleles given within a population (VCAA 2009). The composition of the gene pool is subject to change from time to time and can be affected by the following factors:
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