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cases fora are called directional selection (D), underdominance (E) and overdominance (F). of diploid viability selection (e.g. see section 4.2 in Nagylaki, 1992). The difference is that, barring atypical phenomena such as meiotic drive (Dunn, 1953; Sandler and Novitsky, 1957) or segregation- distortio