( ( crossing-over ( ( The exchange ) ( of ( material ( between ( ( ( ( ( ( homologous chromosomes ) , ) ( during ( the ( first ( meiotic division ) ) ) ) ) , ) ( resulting ( in ( a ( new combination ) ) ) ) ) ( of genes ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB crossing-over) (NP (NP (DT The) (NN exchange)) (PP (IN of) (NP (NP (NN material)) (PP (IN between) (NP (NP (RB homologous) (NNS chromosomes)) (, ,) (PP (IN during) (NP (DT the) (JJ first) (JJ meiotic) (NN division))) (, ,) (VP (VBG resulting) (PP (IN in) (NP (DT a) (JJ new) (NN combination)))) (PP (IN of) (NP (NNS genes))))))))) (. .)))
crossing-over The exchange of material between homologous chromosomes, during the first meiotic division, resulting in a new combination of genes.
(ROOT (S (NP (NNP Crossing-over)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN exchange)) (PP (IN of) (NP (NP (JJ genetic) (NN material)) (PP (IN between) (NP (NP (JJ non-sister) (NNS chromatids)) (PP (IN of) (NP (JJ homologous) (NNS chromosomes))))))))))) (. .)))