The relative frequency of each gene allele tend to remain constant frlm generation to generation is known as
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Genetic drift is a gradual shift in the gene frequencies of small populations (less than 10,000 individuals) resulting in different genotypic ratios. The different genotypes may be expressed as different appearances (phenotypes), such as facial features or bark characteristics in California cypress trees (Cupressus). Genetic drift may also result in populations with different blood type percentages compared with other populations. Genetic drift is a plausible explanation for how racial differences may have first emerged in small, isolated populations when the earth was sparsely inhabited by tribes of people. Races may be defined as populations which differ in their gene frequencies. The frequencies of nonadaptive traits, such as hair color and blood types, may have gradually changed in small, isolated populations during prehistoric times. Today, these genetic differences are reflected in different racial populations. For example, the frequency of type A blood in the American white population is 42 percent, compared with 76 percent for type A blood in the Blackfoot Indian population of the northern United States and Canada. Another example of genetic drift is the marked difference in percentages of positive and negative blood types in Basque people of the Pyrenees Range of Europe compared with people of Asian countries. People from the isolated Pyrenees Range between France and Spain have predominantly Rh negative blood, while this blood type is relatively uncommon among Asian people.