Extranuclear genes (or cytoplasmic genes)

- Extranuclear genes (or cytoplasmic genes) are found in organelles in the cytoplasm​ - Mitochondria, as well as chloroplasts, and other plant plastids carry small circular DNA molecules​ - Extranuclear genes are inherited maternally because the zygote’s cytoplasm comes from the egg​ - The first evidence of extranuclear genes came from studies on the inheritance of yellow or white patches on leaves of an otherwise green plant​