Teh chloroplasts of the Cryptomonads (photosynthetic protist) is very complex with 4 outer membranes. Between the second and the third membrane is a reduced nucleus (called a nucleomorph) with 3 linear chromosomes. Insidde the innermost membrane is also some DNA, though less. Please describe a likely scenario of the event(s) that occured to give rise to this type of Cholorplast.
2007-04-20 16:36:41 · 1 answers · asked by Anthropomorphic 2 in Science & Mathematics ➔ Botany
This sounds like there must have been two endosymbiotic events in succession. The four-membraned chloroplast must be a case of one endosymbiont inside another endosymbiont ... and then that whole complex being inside the full cell. The nucleomorph must be the simplified nucleus of the second endosymbiont which has the first endosymbiont inside it.
Pretty extreme!
2007-04-20 17:30:16 · answer #1 · answered by ecolink 7 · 0⤊ 0⤋