( ( ( ( The ( diploid cell ) ) ( that ( is ( produced ( by ( fusion ( of ( ( ovum and ) sperm ) ) ) ) ) ) ) ) ( -LRB- ( syngamy -RRB- ) ) ) . )
(ROOT (S (VP (NP (NP (DT The) (JJ diploid) (NN cell)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN produced) (PP (IN by) (NP (NP (NN fusion)) (PP (IN of) (NP (NN ovum) (CC and) (NN sperm)))))))))) (PRN (-LRB- -LRB-) (ADVP (RB syngamy)) (-RRB- -RRB-))) (. .)))
The diploid cell that is produced by fusion of ovum and sperm ( syngamy ).
(ROOT (S (SBAR (IN While) (S (NP (NNS spermatogenesis)) (VP (VBZ produces) (NP (CD four) (JJ haploid) (NN sperm) (NNS cells))))) (, ,) (NP (NNS oogenesis)) (VP (VBZ produces) (NP (CD one) (JJ mature) (NN ovum))) (. .)))