( ( ( fission -- ) ( Division ( of ( ( ( ( ( single-celled organisms ) , ) ( especially prokaryotes ) ) , ) ( ( in which ) ( mitosis ( ( does not ) occur ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NN fission)) (: --) (NP (NP (NNP Division)) (PP (IN of) (NP (NP (JJ single-celled) (NNS organisms)) (, ,) (ADJP (RB especially) (JJ prokaryotes)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NNS mitosis)) (VP (VBZ does) (RB not) (VP (VB occur)))))))) (. .)))
fission -- Division of single-celled organisms, especially prokaryotes, in which mitosis does not occur.
(ROOT (S (NP (JJ Binary) (NN fission)) (VP (VBZ is) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (NP (NN cell) (NN division)) (PP (IN in) (NP (JJ prokaryotic) (NNS organisms))))) (SBAR (WHNP (WDT that)) (S (VP (VBZ produces) (NP (JJ identical) (NN offspring))))))) (. .)))
Binary fission is a form of cell division in prokaryotic organisms that produces identical offspring.