( We ( ( have ( ( ( ( 46 chromosomes ) , ) or ) ( ( 23 pairs ) ( of chromosomes ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP have) (NP (NP (CD 46) (NNS chromosomes)) (, ,) (CC or) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes)))))) (. .)))
We have 46 chromosomes, or 23 pairs of chromosomes.
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))