( ( While ( ( germ cells ) ( are ( in interphase ) ) ) ) ( , ( ( each chromosome ) ( ( is ( duplicated ( by ( ( a process ) ( called ( DNA replication ) ) ) ) ) ) ; ) ) ) )
(ROOT (S (SBAR (IN While) (S (NP (NN germ) (NNS cells)) (VP (VBP are) (PP (IN in) (NP (NN interphase)))))) (, ,) (NP (DT each) (NN chromosome)) (VP (VBZ is) (VP (VBN duplicated) (PP (IN by) (NP (NP (DT a) (NN process)) (VP (VBN called) (NP (NN DNA) (NN replication))))))) (: ;)))
While germ cells are in interphase, each chromosome is duplicated by a process called DNA replication ;
(ROOT (S (NP (DT The) (NNS chromosomes)) (VP (VB duplicate) (PP (IN in) (NP (DT the) (JJ interphase) (NN phase)))) (. .)))