具有脆性X染色体[fra(X)]的人表现中度或严重智力低下、大耳、大头、大睾丸、颌部突出等一系列症状。因此,由fra(X)引起的疾病,叫fra(X)综合征。目前,fra(X)综合征已引起医学界普遍重视。从优生的角度来讲,特别重要的是如何防止出生fra(X)综合征的患儿。对fra(X)综合征的产前诊断、确定是否采取治疗性流产、这些无疑对有可能分娩fra(X)综合征患儿风险的妇女是一个有益的手段。 People with a fragile X chromosome [fra (X)] showed moderate or severe mental retardation, large ears, large heads, large testicles, prominent jaws and a series of other symptoms. Therefore, the disease caused by fra (X) is called fra (X) syndrome. At present, fra (X) syndrome has drawn universal attention in the medical community. From an eugenic perspective, it is particularly important to prevent children born with fra (X) syndrome. Prenatal diagnosis of fra (X) syndrome and the determination of therapeutic abortion are undoubtedly a helpful tool for women who may be at risk of giving birth to fra (X) syndrome.