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人群中有 3%的人患有学习无能症。 4 0 %中至重度学习无能症 (智商小于 5 0 )病人和 70 %轻度智力发育迟缓 (智商为 5 0～ 75 )病人的发病原因不明1。据统计 ,未确诊的学习无能症病人中 ,有 30 %～5 0 %可能有遗传因素2 。人类基因图谱的制作和序列分析为寻找染色体异常提供了?
3% of people in the population have learning disabilities. 40% of patients with moderate to severe learning disabilities (IQ less than 50) and 70% of patients with mild mental retardation (IQ 50 to 75) have unknown etiology. According to statistics, 30% ~ 50% of unidentified learning impotence patients may have genetic factors2. Production and Sequence Analysis of Human Gene Map Provided for Searching for Chromosomal Aberrations?