Editing Molecular evolution (section)

===Organelles===
{{Main|Organelle}}
[[File:Animal cells SwissBioPics DL20221120.svg|thumb|150x150px|Animal cell showing organelles.]]
In addition to the [[Nuclear DNA|nuclear genome]], endosymbiont organelles contain their own genetic material. [[Mitochondrion|Mitochondrial]] and [[chloroplast]] DNA varies across taxa, but [[Membrane-bound protein (disambiguation)|membrane-bound protein]]s, especially [[electron transport chain]] constituents are most often encoded in the organelle.  Chloroplasts and [[Mitochondrion|mitochondria]] are maternally inherited in most species, as the organelles must pass through the [[Egg cell|egg]].  In a rare departure, some species of [[mussel]]s are known to inherit mitochondria from father to son.