Twin studies have been used to distinguish between genetic and environmental factors for many disorders in the general population including ectodermal dysplasia, Ellis-van Creveld, and anencephaly. This review focuses on genetic disorders affecting monozygotic, dizygotic, and conjoined twins to gain a better understanding of them. Many studies focus on twins because they have a nearly identical genome, which eliminates environmental factors. In case studies, the concordance rates in monozygotic twins
When considering pregnancy, as a parent genetics can play a significant role in the decision making process. In Bonnie Rough’s 2010 autobiography Carrier, we are introduced to the numerous issues surrounding this couple’s struggle to move forward with a difficult pregnancy. We learn that biological traits can be the deciding factor for many parents when contemplating the ultimate decision of giving birth to a child with potential genetic defects. Whether medically or morally, the nature of terminating