Shared environment, genetics, nonshared environment best arranges genetic and environmental influences on personality and behavior in order of importance.
The shared environment is the condition which suggests the environmental influences which tend to the effect of making siblings more similar to one another, while nonshared environment is the condition which each sibling has independent of their parents and their own relation. For example, while the toys and clothes may be common for the siblings, the teachers and the friends they make are different for the siblings. Shared environment has the potential of creating a harmonious bond between them. Genetics also affects behavior as it has the capacity to influence intellectual ability, personality, and risk for mental illness.
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