Paleoserology
See Also
Description
Progressively changing zones of degree difference in frequency of a trait with movement from one region to another. The gradual decrease in frequency of the B blood allele going west in Europe is an example of such a gradation or clinal distribution.
Clines of group B distribution Source
Discussion
'Discontinuous distribution' is the geographic distribution of a trait such that it appears in high or low frequencies in various areas with little or no gradation between them.
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