( ( The assays ) ( ( ( described ( above ( reflect differences ) ) ) ( in ( fitness ( between ( ( ( ( naturally occurring ) sexually ) and ) ( ( asexually produced ) offspring ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS assays)) (VP (VBD described) (PP (IN above) (NP (JJ reflect) (NNS differences))) (PP (IN in) (NP (NP (NN fitness)) (PP (IN between) (NP (NP (ADJP (RB naturally) (VBG occurring)) (NNS sexually)) (CC and) (NP (ADJP (RB asexually) (VBN produced)) (NN offspring))))))) (. .)))
The assays described above reflect differences in fitness between naturally occurring sexually and asexually produced offspring.
(ROOT (S (NP (DT The) (NN term) (NN fitness)) (VP (VBZ describes) (NP (NP (DT the) (JJ overall) (NN ability)) (PP (IN of) (NP (DT an) (NN animal) (S (VP (TO to) (VP (VB survive) (CC and) (VB produce) (NP (NN offspring))))))))) (. .)))