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近亲结婚是指三代(或五代)以内具有血源关系的男女结婚,是我国婚姻法明令禁止的。据世界卫生组织估计,人群中每个人大约都携带有5—6种隐性遗传病致病基因。随机婚配时,由于夫妻间无亲缘关系,带有相同致病基因的机会很少,就不容易在他们的后代中出现致病基因的纯合化,不容易生下有遗传病的患儿。相反,如果夫妻双方在三代或五代以内有一个(或两个)共同祖先,他们就极可能把他们从共同祖先那里继承下来的两
Marriage of cousins refers to the marriage of men and women with blood relations within three generations (or five generations), which is forbidden by China’s Marriage Law. According to estimates by the World Health Organization, each of the population carries about 5-6 recessive genetic disease-causing genes. Random marriage, due to the unrelated relationship between husband and wife, with the same pathogenic genes with few opportunities, it is not easy to appear in their offspring of homozygosity of pathogenic genes, not easy to give birth to children with genetic diseases. On the contrary, if both spouses have one (or two) common ancestry within three generations or five generations, they are most likely to inherit the two of them from their common ancestry