Fragile X syndrome, a single genetic mutation on the X chromosome, is the most common source of inherited mental impairment, affecting one in every 4,000 boys and one in every 6,000 girls.
脆性X综合征，一个X染色体上的基因突变，是遗传性智力障碍最常见的来源，每4000名男孩和每6000名女孩中就有一名儿童患有该症。
Fragile X syndrome, a single genetic mutation on the X chromosome, is the most common source of inherited mental impairment, affecting one in every 4, 000 boys and one in every 6, 000 girls.
脆性X综合征，一个X染色体上的基因突变，是遗传性智力障碍最常见的来源，每4000名男孩和每6000名女孩中就有一名儿童患有该症。
If so, there could be a familial genetic disorder called fragile X, in which a certain portion of the X chromosome is abnormal.
如果有，那么你很可能有脆弱X基因的家族遗传病。也就是X基因的一部分是异常的。
Objective: to establish an efficient method to detect fragile X chromosome syndrome (FraX) by optimizing PCR amplifying condition.
目的：优化PCR扩增条件，建立一种有效检测脆性X综合征的方法。
The probands of pedigrees E and F of the mother were found with suspicions fragile X chromosome, being confirmed as the non-fragile X pedigrees by the molecular genetic test.
家系先证者及其母亲，F家系先证者发现可疑脆性X染色体，分子遗传学检查证实为非脆性X综合征家系。
The probands of pedigrees E and F of the mother were found with suspicions fragile X chromosome, being confirmed as the non-fragile X pedigrees by the molecular genetic test.
家系先证者及其母亲，F家系先证者发现可疑脆性X染色体，分子遗传学检查证实为非脆性X综合征家系。
应用推荐