( Microevolution ( ( ( ( ( involves ( ( small changes ) ( in ( gene frequencies ) ) ) ) ( within ( ( a population ) ( over ( a ( few ( or ( many generations ) ) ) ) ) ) ) ) , ) ( up ( to ( ( the formation ) ( of ( new species ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Microevolution)) (VP (VBZ involves) (NP (NP (JJ small) (NNS changes)) (PP (IN in) (NP (NN gene) (NNS frequencies)))) (PP (IN within) (NP (NP (DT a) (NN population)) (PP (IN over) (NP (DT a) (JJ few) (CC or) (JJ many) (NNS generations))))) (, ,) (ADVP (RB up) (PP (TO to) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (JJ new) (NNS species))))))) (. .)))
Microevolution involves small changes in gene frequencies within a population over a few or many generations, up to the formation of new species.
(ROOT (S (NP (NNP Microevolution)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NNS species)) (VP (VBZ changes) (PP (IN in) (NP (NP (JJ small) (NNS ways)) (PP (IN over) (NP (NN time))))))))) (. .)))
Microevolution is when a species changes in small ways over time.