( ( ( ( ( In mitosis ) ( , ( there ( is ( ( no pairing ) ( of ( homologs ( at all ) ) ) ) ) ) ) ) -- ) ( chromosomes ( ( ( do line ) up ) ( ( ( ( ( at metaphase ) , ) but ) not ) ( in pairs ) ) ) ) ) . )
(ROOT (S (S (PP (IN In) (NP (NNS mitosis))) (, ,) (NP (EX there)) (VP (VBZ is) (NP (NP (DT no) (NN pairing)) (PP (IN of) (NP (NP (NNS homologs)) (ADVP (IN at) (DT all))))))) (: --) (S (NP (NNS chromosomes)) (VP (VBP do) (NP (NN line)) (PRT (RP up)) (PP (PP (IN at) (NP (NN metaphase))) (, ,) (CC but) (RB not) (PP (IN in) (NP (NNS pairs)))))) (. .)))
In mitosis, there is no pairing of homologs at all -- chromosomes do line up at metaphase, but not in pairs.
(ROOT (S (PP (IN In) (NP (JJ metaphase) (NN ii) (NN stage))) (, ,) (NP (NNS chromosomes)) (VP (VBP line) (ADVP (RB up) (NP (CD one)) (PP (IN on) (NP (NP (NN top)) (PP (IN of) (NP (DT each) (JJ other)))))) (PP (IN along) (NP (NP (DT the) (NN middle)) (PP (IN of) (NP (DT the) (NN cell))))) (, ,) (ADJP (JJ similar) (PP (TO to) (SBAR (WHADVP (WRB how)) (S (NP (PRP they)) (VP (VBP line) (PRT (RP up)) (PP (IN in) (NP (NNS mitosis))))))))) (. .)))