( ( ( ( Fertilization ( ( The ( entire process ) ) ( of ( sexual reproduction ) ) ) ) ( is ( centred ( around ( ( the act ) ( of ( ( fertilization , ) ( which ( ( ( ( consists essentially ) ( of ( ( the fusion ) ( of ( ( ( ( ( two cells ) , ) ( the ( male sperm ) ) ) and ) ( the ( female egg ) ) ) ) ) ) ) , ) ( to ( form one ) ) ) ) ) ) ) ) ) ) ) ( ( ( single cell ) , ) ( the zygote ) ) ) . )
(ROOT (SINV (VP (VBN Fertilization) (NP (NP (DT The) (JJ entire) (NN process)) (PP (IN of) (NP (JJ sexual) (NN reproduction))))) (VP (VBZ is) (VP (VBN centred) (PP (IN around) (NP (NP (DT the) (NN act)) (PP (IN of) (NP (NP (NN fertilization)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ consists) (ADVP (RB essentially)) (PP (IN of) (NP (NP (DT the) (NN fusion)) (PP (IN of) (NP (NP (CD two) (NNS cells)) (, ,) (NP (DT the) (JJ male) (NN sperm)) (CC and) (NP (DT the) (JJ female) (NN egg)))))) (, ,) (S (VP (TO to) (VP (VB form) (NP (CD one)))))))))))))) (NP (NP (JJ single) (NN cell)) (, ,) (NP (DT the) (NN zygote))) (. .)))
Fertilization The entire process of sexual reproduction is centred around the act of fertilization, which consists essentially of the fusion of two cells, the male sperm and the female egg, to form one single cell, the zygote.
(ROOT (S (PP (IN After) (NP (NN fertilization))) (, ,) (NP (DT a) (NN zygote)) (VP (VBZ forms) (PP (IN into) (NP (CD two) (NNS cells)))) (. .)))