Final answer:
Genes play a significant role in a person's existence and behavior, but it is not solely determined by genetic disposition.
Step-by-step explanation:
Genes play a significant role in a person's existence and behavior, but it is not solely determined by genetic disposition. Our unique experiences and interactions in our environment also influence how certain traits are expressed. For example, genes are associated with temperament and psychological disorders, but these traits are also influenced by individual history of interactions and conditioning-learned behavior patterns.
Thus, while genes provide the biological blueprint, they interact with our environment to shape who we become. This interaction between nature and nurture is complex and varies for different individuals.