( ( ( ( Cells and ) organisms ) ( with ( pairs ( of ( homologous chromosomes ) ) ) ) ) ( ( are ( called diploid ) ) . ) )
(ROOT (S (NP (NP (NNS Cells) (CC and) (NNS organisms)) (PP (IN with) (NP (NP (NNS pairs)) (PP (IN of) (NP (JJ homologous) (NNS chromosomes)))))) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ diploid))))) (. .)))
Cells and organisms with pairs of homologous chromosomes are called diploid.
(ROOT (S (NP (DT A) (JJ diploid) (NN cell)) (VP (VBZ is) (NP (NP (DT a) (NN cell)) (PP (IN with) (NP (CD two) (NNS chromosomes))))) (. .)))