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This essay will first discuss the phenotypic effects of cac mutation, then the effects of slowpoke mutation on the courtship song, and finally the role played by genetic variation in channels in Drosophila evolution.
(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))))))))))) (. .)))