( ( ( Linkage ( ( The tendency ) ( for ( certain genes ) ) ) ) ( to ( be ( ( inherited ( together ( due ( to ( their ( physical proximity ) ) ) ) ) ) ( on ( the chromosome ) ) ) ) ) ) . )
(ROOT (S (VP (VB Linkage) (NP (NP (DT The) (NN tendency)) (PP (IN for) (NP (JJ certain) (NNS genes)))) (S (VP (TO to) (VP (VB be) (VP (VBN inherited) (ADJP (RB together) (JJ due) (PP (TO to) (NP (PRP$ their) (JJ physical) (NN proximity)))) (PP (IN on) (NP (DT the) (NN chromosome)))))))) (. .)))
Linkage The tendency for certain genes to be inherited together due to their physical proximity on the chromosome.
(ROOT (S (NP (JJ Certain) (NNS characteristics)) (VP (VBP are) (ADVP (RB frequently)) (VP (VBN inherited) (ADVP (RB together)) (PP (RB because) (IN of) (ADJP (JJ linkage))))) (. .)))