Personality researchers sometimes examine the personalities of children who were adopted shortly after birth. they do this because genetic and environmental influences are not confounded like they are when examining children raised by their biological parents.
This is further explained below.
Generally, It is common practice to refer to the father and mother whose DNA is carried by a kid as the child's "biological parents." It is not necessary for somebody to be connected to a kid by blood in order for them to be considered the child's legal parents. This is the case, for instance, when a child is adopted.
In conclusion, Researchers that study personalities will often investigate the personalities of children who were adopted within a short period of time after birth. They do this because the genetic and environmental variables are not mixed up in the same way that they are when evaluating children who were raised by their biological parents.
Read more about biological parents.
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