Ambidirectional dominance

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Ambidirectional dominance occurs in a situation where multiple genes influence a phenotype and dominance is in different directions depending on the gene. For example, for gene A increased height is dominant, while for gene B decreased height is dominant. The opposite situation, where all genes show dominance in the same direction, is called directional dominance. [1] In the same example, for both genes A and B increased height is dominant. According to Broadhurst, ambidirectional dominance is the result of stabilising selection in the evolutionary past. [1] Ambidirectional dominance has been found for exploratory behaviours in mice [2] [3] [4] and paradise fish. [5]

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References

  1. 1 2 Broadhurst, PL; Jinks, JL (1974). "What genetical architecture can tell us about the natural selection of behavioural traits". In van Abeelen, JHF (ed.). The Genetics of Behaviour. Amsterdam: North Holland. pp. 43–63. ISBN   0-7204-7137-0. OCLC   1365968.
  2. Crusio WE; van Abeelen JH (February 1986). "The genetic architecture of behavioural responses to novelty in mice". Heredity . 56 (1): 55–63. doi: 10.1038/hdy.1986.8 . PMID   3943979.
  3. Crusio WE, Schwegler H, van Abeelen JH (February 1989). "Behavioral responses to novelty and structural variation of the hippocampus in mice. I. Quantitative-genetic analysis of behavior in the open-field". Behavioural Brain Research . 32 (1): 75–80. doi:10.1016/S0166-4328(89)80074-9. PMID   2930636. S2CID   675083.
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  5. Gerlai R; Crusio WE; Csányi V (July 1990). "Inheritance of species-specific behaviors in the paradise fish (Macropodus opercularis): a diallel study". Behavior Genetics . 20 (4): 487–98. doi:10.1007/BF01067715. PMID   2256892. S2CID   22641118.