A trait or disease is called heritable if monozygotic twins are more similar to each other than dizygotic twins.
如果一种性状或疾病在同卵双胞胎中的同时发生的概率高于异卵双胞胎，那么这种性状或疾病是“可遗传的”。
Objectives: Genotype phenotype correlation in 2 pairs of monozygotic twins with ARVC and the role of environmental factors are analyzed.
目的：在两对ARVC单卵双生子中分析基因型与表型的相关性以及环境因素的作用。
In addition, more information about the cause of monozygotic twins could be collected in the future by a straightforward check of the Numbers of placentas and sacs when the babies are born.
另外，将来有关单卵双胞胎原因更多的信息可以直接通过出生后核对胎盘和羊膜囊的数目来获得。
Nor does classic genetics explain how, despite their identical DNA sequences, monozygotic twins1 or cloned animals2 can have different phenotypes and different susceptibilities to a disease.
尽管DNA序列相同，单合子的双胞胎或者克隆的动物如何有不同的表现型和对同一疾病不同的易感性，经典的遗传学也不能解释。
Nor does classic genetics explain how, despite their identical DNA sequences, monozygotic twins1 or cloned animals2 can have different phenotypes and different susceptibilities to a disease.
尽管DNA序列相同，单合子的双胞胎或者克隆的动物如何有不同的表现型和对同一疾病不同的易感性，经典的遗传学也不能解释。
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