Balancing selection
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Balancing selection (also known as disruptive selection) is selection that favours diversity. Under balancing selection, the spread of an allele never reaches fixation, and therefore it can initially seem to be undergoing positive selection, but it then undergoes negative selection when its frequency is too high. Thus alleles cannot be classified as advantageous or deleterious. This type of selection can have different forms, including frequency-dependent selection, which is central to the evolution of mimicry, and overdominance. (Hurst 2009)
