Twin studies are studies conducted on identical or fraternal twins. They aim to reveal the importance of environmental and genetic influences for traits, phenotypes , and disorders. Twin research is considered a key tool in behavioral genetics and in content fields, from biology to psychology. Twin studies are part of the broader methodology used in behavior genetics , which uses all data that are genetically informative — siblings studies, adoption studies, pedigree, etc.
Identical Twins Hint at How Environments Change Gene Expression
Privation - Failure to Form an Attachment | Simply Psychology
Oskar Stohr and Jack Yufe were identical twins, separated shortly after birth. Oskar was raised as a Catholic and a Nazi. Jack grew up as a Jew. At the time they were born in , their Jewish father and German mother were close to divorce.
Paula Bernstein left and Elyse Schein are identical twins who were separated as infants and adopted by different families. Paula Bernstein left and Elyse Schein were reunited in , when they were They are authors of a new memoir, Identical Strangers. Elena Seibert hide caption.
When the twins were finally reunited at the age of 39 in , they discovered they both suffered from tension headaches, were prone to nail biting, smoked Salem cigarettes, drove the same type of car and even vacationed at the same beach in Florida. Genes can help explain why someone is gay or straight, religious or not, brainy or not, and even whether they're likely to develop gum disease, one psychologist explains. Such broad-ranging genetic effects first came to light in a landmark study — Minnesota Twin Family Study — conducted from to , which followed identical and fraternal twins who were separated at an early age.