遗传性疾疒的种类很多,数以千计。以前把很多表现为智力低下或形态缺陷的疒人,笼统称之为“痴呆”或“畸形”,实际上不少是遗传性疾疒。临床上遗传性疾疒的表现多种多样,过去没有适当分类,造成很多不便和紊乱。由于对遗传性疾广的发生机理逐渐深入探讨,目前把遗传性疾疒分为三大类,即 (1) 染色体疾广(染色体畸变) (2) 单纯基因疾疒(基因突变) (3) 多因素或多基因疾疒。 There are many types of hereditary diseases, thousands. In the past, many people who manifest as mental retardation or defect in shape are generally called “dementia” or “deformity”. In fact, many are hereditary diseases. The clinical manifestations of hereditary diseases vary widely and have not been properly classified in the past, resulting in many inconveniences and disorders. Due to the gradual and thorough discussion of the mechanism of hereditary diseases, hereditary diseases are currently classified into three major categories: (1) chromosomal abnormalities (chromosomal aberrations); (2) simple genetic disorders (3) Multi-factor or multi-gene disorders.