( ( ( ( ( Mutations , ) or ) ( alteration ( of ( ( genes , ) ( along ( with ( genetic recombination ) ) ) ) ) ) ) , ) ( ( increase ( ( the ( genetic variation ) ) ( in ( ( a population ) ( of animals ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Mutations)) (, ,) (CC or) (NP (NP (NN alteration)) (PP (IN of) (NP (NP (NNS genes)) (, ,) (ADVP (IN along) (PP (IN with) (NP (JJ genetic) (NN recombination))))))) (, ,)) (VP (VBP increase) (NP (NP (DT the) (JJ genetic) (NN variation)) (PP (IN in) (NP (NP (DT a) (NN population)) (PP (IN of) (NP (NNS animals))))))) (. .)))
Mutations, or alteration of genes, along with genetic recombination, increase the genetic variation in a population of animals.
(ROOT (S (NP (NNP Mutation)) (VP (VBZ is) (ADJP (JJ essential) (PP (IN in) (NP (NP (NN order)) (PP (IN for) (NP (NN evolution)))))) (S (VP (TO to) (VP (VB occur) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ increases) (S (NP (NP (JJ genetic) (NN variation)) (CC and) (NP (NP (DT the) (NN potential)) (PP (IN for) (NP (NNS individuals))))) (VP (TO to) (VP (VB differ))))))))))) (. .)))