某群体经典型苯丙酮尿症的群体发病率为1/1000，一对表型正常的姨表兄妹婚配，他们后代罹患苯丙酮尿症的风险是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24544' and id < 2107770 and id<>'2107770' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24544' and id > 2107770 and id<>'2107770' order by id asc limit 5