( ( Sexual reproduction ) ( ( involves ( ( ( the union ) ( of ( ( ( ( ( an egg ) ( -LRB- ( ( female ( sex cell ) ) -RRB- ) ) ) and ) sperm ) ( -LRB- ( ( male ( sex cell ) ) -RRB- ) ) ) ) ) ( to ( produce ( ( a cell ) ( that ( is ( genetically ( different ( than ( the ( parent cells ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Sexual) (NN reproduction)) (VP (VBZ involves) (S (NP (NP (DT the) (NN union)) (PP (IN of) (NP (NP (DT an) (NN egg)) (PRN (-LRB- -LRB-) (NP (JJ female) (NN sex) (NN cell)) (-RRB- -RRB-)) (CC and) (NP (NN sperm)) (PRN (-LRB- -LRB-) (NP (JJ male) (NN sex) (NN cell)) (-RRB- -RRB-))))) (VP (TO to) (VP (VB produce) (NP (NP (DT a) (NN cell)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (RB genetically) (JJ different) (PP (IN than) (NP (DT the) (NN parent) (NNS cells)))))))))))) (. .)))
Sexual reproduction involves the union of an       egg (female sex cell) and sperm (male sex cell) to produce a cell that is       genetically different than the parent cells.
(ROOT (S (NP (NP (JJ Sexual) (NN reproduction)) (, ,) (PP (IN in) (NP (NN general))) (, ,)) (VP (VBZ relies) (PP (IN on) (NP (NP (NNS sets)) (PP (IN of) (NP (NP (NNS cells)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (NP (NP (NNS precursors)) (PP (IN for) (NP (NNS eggs) (CC and) (NN sperm)))))))))))) (. .)))