( ( In ( sexual reproduction ) ) ( ( the cells ) ( ( used ( for ( ( ( ( reproduction , ) ( called gametes ) ) , ) ( are ( either ( ( eggs or ) sperms ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (JJ sexual) (NN reproduction))) (NP (DT the) (NNS cells)) (VP (VBD used) (SBAR (IN for) (S (NP (NP (NN reproduction)) (, ,) (VP (VBN called) (NP (NNS gametes))) (, ,)) (VP (VBP are) (NP (CC either) (NNS eggs) (CC or) (NNS sperms)))))) (. .)))
In sexual reproduction the cells used for reproduction, called gametes, are either eggs or sperms.
(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)))))))))))) (. .)))