Best answer: Well, the previous answer ALMOST is correct. Since the same twins have the same DNA or genetic makeup, twin research is very useful in the old "nature and cultivation" discussion. If you believe in the "natural" theory, we are all genetic consequences, and the twins should be bred in the same environment, and the same personality traits will be produced
When the twins are parting at birth or early childhood and are growing up in different environments - that person is an abusive family in poverty, saying it is a luxurious and affectionate parent - and then Eventually you become an adult with the same personality, you will also have a strong argument against natural theory
On the other hand, the twins who grew up in a bad house are continuous killers, and the twins who grew up in a considerate home were found to be Nobel laureates.
Twin studies are the same twin or sibling twin studies. Their purpose is to clarify the importance of environmental and genetic influences on traits, phenotypes and diseases. Twin studies are considered an important tool in the field of behavioral genetics and content, from biology to psychology. Twin studies are part of a wider approach used in behavioral genetics - it uses all genetic information data - sibling research, adoption studies, etc. These studies have been used to track characteristics from personal behavior to severe psychological performance. Diseases such as schizophrenia
The three most common research methods in behavioral genetics are family research, twin studies, and adoption studies. In family survey, we decide whether a function is functioning at home. If personality traits are being carried out in the family, this function may contain genetic elements because children share 50% of genes with each parent. Twin studies involve analysis of the differences between the same twin and sibling twins. Since the same twins share 100% of the same gene and brothers twins account for only 50% of the same gene, if there is a genetic element in personality traits, the same twins should be more similar than sibling twins is.
Today, scientists make use of biological differences between the same twin and brothers twins Galton had missed, making twin research one of the most powerful tools in behavioral science and genetic science . They used twin studies to find answers to bullying, schizophrenia, the effects of marijuana use, obesity, IQ and sexual orientation. In addition, 143 years earlier than twin studies at Galton, modern scientists are looking for new ways to study twins and find answers using their similarities and differences.