Dr. Ko Tsang-ming, director of the Department of Medical Genetics at NTUH, explains that the human genome contains some 100,000 genes, and every person has some five to ten abnormal ones. If both the man and the woman in a couple happen to have a defect in the same gene, this may lead to a genetic disorder in their offspring.
台大醫院優生保健部主任柯滄銘指出，人類大約有十萬個基因，而每個人身上都有五到十個不正常的基因，萬一碰巧男、女雙方在同一個基因有缺陷，就會導致下一代出現基因異常的罕見疾病。