( Tully ( ( ( notes also ) ( ( ( ( that ( ( many ( different genes ) ) ( have ( been ( found ( to ( contribute ( to ( a ( particular behavior ) ) ) ) ) ) ) ) ) ) , ) and ) ( that ( ( the ( genetic influence ) ) ( is ( impossible ( to ( disentangle ( from ( environmental influences ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Tully)) (VP (VBZ notes) (ADVP (RB also)) (SBAR (SBAR (IN that) (S (NP (JJ many) (JJ different) (NNS genes)) (VP (VBP have) (VP (VBN been) (VP (VBN found) (S (VP (TO to) (VP (VB contribute) (PP (TO to) (NP (DT a) (JJ particular) (NN behavior))))))))))) (, ,) (CC and) (SBAR (IN that) (S (NP (DT the) (JJ genetic) (NN influence)) (VP (VBZ is) (ADJP (JJ impossible) (S (VP (TO to) (VP (VB disentangle) (PP (IN from) (NP (JJ environmental) (NNS influences)))))))))))) (. .)))
Tully notes also that many different genes have been found to contribute to a particular behavior, and that the genetic influence is impossible to disentangle from environmental influences.
(ROOT (S (NP (NP (NNS Behaviors)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP are) (ADVP (RB closely)) (VP (VBN controlled) (PP (IN by) (NP (NNS genes))))) (CC and) (VP (VBP have) (NP (NP (RB little)) (PP (TO to) (NP (DT no) (JJ environmental) (NN influence))))))))) (VP (VBP are) (VP (VBN called) (NP (JJ innate) (NNS behaviors)))) (. .)))