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from | Encarta |  |
Distribution of O Allele |
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| The distribution of the O allele (form) of the ABO blood group gene demonstrates the continuous nature of human biological variation. The frequency with which the allele appears in a population varies gradually across large geographic regions, a pattern of variation known as a cline. The lack of sharp discontinuities in patterns of human physical variation poses a problem for racial classifiers. | ||||||
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