( ( In humans ) ( , ( ( ( ( ( ( our cells ) ( have ( ( 23 pairs ) ( of chromosomes ) ) ) ) , ) and ) ( ( ( each chromosome ) ( within ( a pair ) ) ) ( is ( called ( a ( homologous chromosome ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (NNS humans))) (, ,) (S (NP (PRP$ our) (NNS cells)) (VP (VBP have) (NP (NP (CD 23) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes)))))) (, ,) (CC and) (S (NP (NP (DT each) (NN chromosome)) (PP (IN within) (NP (DT a) (NN pair)))) (VP (VBZ is) (VP (VBN called) (NP (DT a) (JJ homologous) (NN chromosome))))) (. .)))
In humans, our cells have 23 pairs of chromosomes, and each chromosome within a pair is called a homologous chromosome.
(ROOT (S (NP (NNS Humans)) (VP (VBP have) (NP (NP (CD 23) (JJ pairs) (NNS pairs)) (PP (IN of) (NP (NNS chromosomes))))) (. .)))