Gene flow

In contrast to random changes in gene frequencies in small populations, which are the result of gene shift (a random change in gene frequency in small populations), a smooth change in gene frequency occurs in large populations due to gene flow. This occurs mainly between sub-populations through migrating individuals.


 * A typical example is the steady decrease in frequency of the D alleles of the of the AB0 blood group system from approximately 0.6 in Western Europe to 0.3 in East Asia.
 * Another example is the inflow of "white" genes into the gene pool of African Americans.

Related articles

 * Genetic drift
 * Evolution
 * Selection
 * Migration
 * Small population