what is epsitasis
- This is when one of two (or several genes) has been changed in some way so the phenotype (what is seen on the organism) is called the epsitasis gene. Epsitasis masks the expressed of the other gene and therefore the other gene will not be physically seen on the organism
- Epistasis is when the effect of one gene depends on the presence of one or more 'modifier genes' (genetic background). Similarly, epistatic mutations have different effects in combination than individually