Underdominance tends to lower the number of heterozygotes over many generations.
Heterozygous having a disadvantage in reproductive success is called underdominance. This condition is also called negative overdominance.
Underdominance cannot preserve genetic variation, and one of the alleles will either be lost or spread to fixation depending on its initial frequency.
In evolution, the selection favoring heterozygotes is called overdominance while the selection favoring homozygotes is called underdominance.
An example of underdominance can be seen in an African butterfly species (Pseudacraea eurytus) which utilizes batesian mimicry to escape predation. They have two alleles to confer the appearance of local butterflies that are toxic to predators.
The butterfly with heterozygous allele shows an intermediate appearance and thus experiences increased predation than the butterfly with homozygous alleles.
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