We’ve all been through Biology class, so we’re familiar with Punic squares and the likelihood that two brown-eyed parents will have brown-eyed children. And we also know that genetics has something to do with our hair color, height, and build. But what about our personality? Nature vs. nurture is an age-old controversy. It is one argument that has yet to be won, and theories abound. One thing is clear, however: there is definitely more to it than nature. A family with multiple children makes this obvious because each child has his or her own distinct personality. Rarely is there a family, even one with twins, where each child exhibits identical personality traits to that of his siblings; rather, each child develops his own personality through nurture. Anyone who has a mother, a father, or a sibling can attest to the fact that there is a lot more to it than nature.
Whether a person is shy or extroverted, conservative or adventurous, that person inherited these traits from his parents. Although personality is not completely dependent upon genetics, heredity lays the foundation for a person’s personality traits and tendencies. After the foundation has been laid, nurture then steps in and works to develop what nature has presented. For example, through nurture a shy person can learn to become more outgoing; however, this manifestation of personality will never be completely natural for this person because extroversion is not the foundation nature built for him. Equally, a child who does not seem to have natural musical talent may, through nurture, learn to play the piano; however, he will likely have to work twice as hard to become musically fluent as another child who is an inherently talented musician. Clearly, nature and nurture both play a very important role in the development of personality, but it is nature that initially forms a personality, and it is nature that ultimately shines through no matter how much nurturing takes place.
Which of the following would weaken the argument presented by the author in Passage A?