To Start with, the adoption studies is among the early century studies which was first introduced by Francis Galton and later drawn the attention of other researchers in countries such as Europe among others (Adoption.com). It aligns with the theory of nature that suggests that certain traits are inborn and they cannot be controlled even by environment (about.com).
The main intent of the study is to show the impact of biological factors in determining the traits of an individual regardless of the environment. Following the Danish adoption study of schizophrenia, the adopted children whose parents had schizophrenia ended up suffering from that disorder despite being brought up in different environments by parents who do not have the disorders (Haimowitz). On the other hand, those whose parents did not have the trait they also did not have. The study considers both the environmental and the biological factors that affect the personality of persons in establishing the major impacting factor.
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