Phenotypic switching is switching between two cell-types. An example is Candida albicans

Candida albicans

Candida albicans is a diploid fungus that grows both as yeast and filamentous cells and a causal agent of opportunistic oral and genital infections in humans. Systemic fungal infections including those by C...

, which, when it infects host tissue, switches from the usual unicellular yeast-like form of into an invasive, multicellular filamentous form. This switching between two cell-types is known as dimorphism.

Phenotypic switching in C. albicans include the switch from white cells to opaque cells in need for sexual mating.