( ( ( Haploid gametophytes ) ( -LRB- ( n -RRB- ) ) ) ( ( ( produce ( haploid gametes ) ) ( by mitosis ) ) . ) )
(ROOT (S (NP (NP (JJ Haploid) (NNS gametophytes)) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-))) (VP (VBP produce) (NP (JJ haploid) (NNS gametes)) (PP (IN by) (NP (NNS mitosis)))) (. .)))
Haploid gametophytes (n) produce haploid gametes by mitosis.
(ROOT (S (NP (DT The) (JJ haploid) (NN gametophyte)) (VP (VBZ produces) (NP (NNS gametes)) (PP (IN through) (NP (NNS mitosis)))) (. .)))