Comment: well I could do some more searching.

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In reply to comment: Hi MarkDran (see in situ)

well I could do some more searching.

http://en.wikipedia.org/wiki/FOXP2#Clinical_significance is where you should read. I just know bout that one because when they put the human version of the gene in mice it makes them more chatty. But in general you can find a number of genes that must be functional for full linguisitic ability. This is likely because a number of brain structures are involved. When it comes to genetic basis of language there is probably not going to be a single gene but like brain lesions, if you do enough gene knockdowns you can take out language. It would take research to make a gene knockdown map of language. THen we could make some viruses and finally get some peace and quiet.