Tuesday, February 9, 2016
Twins and Adopted Siblings Just a few random facts
An example of an inherited trait that has been studied in twins and adoptions is personality. Identical twins raised apart are more similar in personality than pairs of people randomly selected. Identical twins are more similar than fraternal twins. Also in personality, biological siblings are more similar than adoptive ones. Each observation suggests to an extent personality is heritable. The same studies show both environment and genes should be examined. This goes for adoption studies too. Adopted siblings share only family environment. It has been indicated that by adulthood the adopted siblings' personalities are no more similar than random pairs of strangers. Identical twins share all of their genes while fraternal twins share 50% of them.