许多科学家选择双胎这一特殊人群来研究某些疾病的病因 ,因为他们认为双胎具有相同的遗传特性。但很多文献表明即使是单卵双胎也可能存在遗传、表型及生长发育的不同一性。通过研究单卵双胎的不同一性 ,可以更深入地认识双胎形成的原因和过程 ,从而有效地预防和治疗单卵双胎的 Many scientists choose this special group of twins to study the etiology of certain diseases because they consider that twins have the same genetic traits. However, many literatures show that even monozygotic twins may have different genetics, phenotypes and growth and development. By studying the different sexes of monozygotic twins, we can get a deeper understanding of the causes and processes of twins formation, so as to effectively prevent and treat monozygotic twins