- Aquiring dominant alleles that negate the deliterious effect of recessive alleles accumulated through inbreeding (2).
- Alleles that when found in a heterozygote are advantageous but when found in a homozygote are harmful (2).
- Interactions between genes which lead to changes in phenotype. For example, the presence or absence of one gene may affect the expression of another gene (2).
1. Wikipedia (2013), Heterosis http://en.wikipedia.org/wiki/Heterosis
2. Lippman ZB & Zamir D (2007) Heterosis: revisiting the magic. Trends in Genetics 23(2):60-66.
3. Birchler JA, Yao H, Chudalayandi S, Vaiman D, & Veitia RA (2010) Heterosis. The Plant cell 22(7):2105- 2112.