circular overlap

'circular overlap' can also refer to...


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The phenomenon in which a chain of continuous and intergrading populations of one species curves back until the terminal links overlap each other. Individuals from the terminal populations are then found to be reproductively isolated from each other; that is, they behave as if they belonged to separate species. A ring of races so formed is referred to as a Rassenkreis.

Subjects: Genetics and Genomics.

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