Personality, in my understanding, is what defines a particular person, therefore, while personalities may have great resemblance between two people. It is still believed that each set of personalities of two different possessors should differ at some point, just like fingerprints. It seems much easier to embrace a genetic interpretation towards personality differentiation. Like son, like father, it is reasonably understood by many people that an offspring takes after his or her parents. Every one of us obtains an unique genetic code, however, it is still far-fetched to attribute personality differentiation to genes for we have numerous examples to show that children more than often fall out with their parents and have their own opinions against that of their parents. If personality truly originates from previous generations, we should be able to see a stronger link between two generations.

A more acceptable argument would be personalities are fostered during a person’s development through the influences brought by his surroundings (school, friends, family, colleagues, social events. etc.). Following our initial statement that there are no identical personalities, we should wake up to the fact nobody lives in an identical environment with another. People go to different schools, have different friends, make different decisions and experience different things. Altogether they determine an unique reality for a particular person. Hypothetically, we have this twins who share exactly the same DNA and their parents divorced right upon their birth, for which each of the two gets to live with either mom or dad. Conceivably, by the time they become adults, they should display different personalities even they share the same genetic traits. Similarly, a child who is adopted is likely to resemble his or her foster parents in personality instead of the biological ones only because he or she has a different life experience when living with different people.