( ( ( ( ( ( ON ( THE ( MOLECULAR BIOLOGY ) ) ) ( OF ( SPERM-EGG ( FERTILIZATION ( Sexual reproduction ) ) ) ) ) , ) ( ( ( defined ( in ( ( this context ) ( as ( ( the fusion ) ( of ( ( two ( haploid cells ) ) ( -LRB- ( gametes -RRB- ) ) ) ) ) ) ) ) ) ( during fertilization ) ) ( to ( form ( a ( diploid zygote ) ) ) ) ) ) , ) ( ( occurs ( in ( ( almost all ) eukaryotes ) ) ) . ) )
(ROOT (S (NP (NP (NNP ON) (NNP THE) (NNP MOLECULAR) (NNP BIOLOGY)) (PP (IN OF) (NP (NNP SPERM-EGG) (NNP FERTILIZATION) (NNP Sexual) (NNP reproduction))) (, ,) (VP (VBN defined) (PP (IN in) (NP (NP (DT this) (NN context)) (PP (IN as) (NP (NP (DT the) (NN fusion)) (PP (IN of) (NP (NP (CD two) (JJ haploid) (NNS cells)) (PRN (-LRB- -LRB-) (NP (NNS gametes)) (-RRB- -RRB-)))))))) (PP (IN during) (NP (NN fertilization))) (S (VP (TO to) (VP (VB form) (NP (DT a) (JJ diploid) (NN zygote)))))) (, ,)) (VP (VBZ occurs) (PP (IN in) (NP (QP (RB almost) (DT all)) (NNS eukaryotes)))) (. .)))
ON THE MOLECULAR BIOLOGY OF SPERM-EGG FERTILIZATION Sexual reproduction, defined in this context as the fusion of two haploid cells (gametes) during fertilization to form a diploid zygote, occurs in almost all eukaryotes.
(ROOT (S (NP (NP (JJ Sexual) (NN reproduction)) (PP (IN with) (NP (NNS gametes) (CC and) (NN fertilization)))) (VP (VBZ produces) (NP (JJ diploid) (NN sporophyte))) (. .)))