( This ( ( is ( ( the ( only phylum ) ) ( ( in which ) ( ( the ( gametophyte stage ) ) ( is ( dominant ( to ( the ( sporophyte stage ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN phylum)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT the) (JJ gametophyte) (NN stage)) (VP (VBZ is) (ADJP (JJ dominant) (PP (TO to) (NP (DT the) (JJ sporophyte) (NN stage))))))))) (. .)))
This is the only phylum in which the gametophyte stage is dominant to the sporophyte stage.
(ROOT (S (NP (DT The) (JJ sporophyte) (NN stage)) (VP (VBZ is) (NP (NP (DT the) (JJ dominant) (NN stage)) (PP (IN of) (NP (NP (DT the) (NN lifecycle)) (PP (IN of) (NP (DT a) (NN fern))))))) (. .)))