( ( ( DNA changes ) ( in ( a gene ) ) ) ( ( are ( called mutations ) ) . ) )
(ROOT (S (NP (NP (NN DNA) (NNS changes)) (PP (IN in) (NP (DT a) (NN gene)))) (VP (VBP are) (VP (VBN called) (NP (NNS mutations)))) (. .)))
DNA changes in a gene are called mutations.
(ROOT (S (NP (NNS Mutations)) (VP (VP (VBP are) (NP (NP (NNS changes)) (PP (TO to) (NP (NP (DT an) (NN organism) (POS 's)) (NN dna))))) (CC and) (VP (VBP are) (NP (NP (DT an) (JJ important) (NN driver)) (PP (IN of) (NP (NP (NN diversity)) (PP (IN in) (NP (NNS populations)))))))) (. .)))