当某一遗传病（或性状）是由很多对基因决定,而每对基因作用都是较微小的,无显性与隐性之别,其作用又是积累的时,称为多基因遗传（Polygenic inheritance）。当多对基因相加的结果超过一定阈值时候,可以呈现疾病,称为多基因遗传病。有时,除遗传因素外,环境因素也起作用,称为多基因遗传病（multifactorial inheritance）以下统称为多基因病。 多基因遗传病的研究还只有十几年时间,目前主要包括一些常见病（如高血压,重型精神病）与常见先天畸形（唇裂,先天性心脏病等）。由于这些病发病率高,对健康影响较大。因此是医学科学和医学遗传学 When a genetic disease (or trait) is determined by a lot of genes, and each pair of genes are relatively small, non-obvious and recessive, and its role is accumulated, known as polygenic inheritance Polygenic inheritance. When the result of adding multiple pairs of genes exceeds a certain threshold, the disease can be presented as a polygenic disease. Sometimes, in addition to genetic factors, environmental factors also play a role, known as polygenic inheritance (multifactorial inheritance) hereinafter collectively referred to as polygenic disease. The study of polygenic disease is still only a dozen years. Currently, it mainly includes some common diseases (such as hypertension and severe psychosis) and common congenital malformations (cleft lip and congenital heart disease). Due to the high incidence of these diseases, it has a great health impact. So is medical science and medical genetics