孟买型个体的产生是因为下列哪种基因为无效基因

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24539' and id < 2107969 and id<>'2107969' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24539' and id > 2107969 and id<>'2107969' order by id asc limit 5