( ( Due ( to ( ( the fusion ) ( of ( the ( two gametes ) ) ) ) ) ) ( , ( ( a ( human zygote ) ) ( ( contains ( ( 46 chromosomes ) ( -LRB- ( ( ( i.e. 23 ) pairs ) -RRB- ) ) ) ) . ) ) ) )
(ROOT (S (PP (JJ Due) (TO to) (NP (NP (DT the) (NN fusion)) (PP (IN of) (NP (DT the) (CD two) (NNS gametes))))) (, ,) (NP (DT a) (JJ human) (NN zygote)) (VP (VBZ contains) (NP (NP (CD 46) (NNS chromosomes)) (PRN (-LRB- -LRB-) (NP (QP (CD i.e.) (CD 23)) (NNS pairs)) (-RRB- -RRB-)))) (. .)))
Due to the fusion of the two gametes, a human zygote contains 46 chromosomes (i.e. 23 pairs).
(ROOT (S (PP (IN In) (NP (NNS humans))) (, ,) (NP (DT a) (NN zygote)) (VP (VBZ has) (NP (CD 46) (NNS chromosomes))) (. .)))