There are several antonyms for the phrase "genetic make ups," which refers to the hereditary traits that each person possesses. Some possible antonyms include "environmental factors," "cultural influences," "nurture," and "non-biological determinants." These terms represent the external factors that can shape a person's behavior, beliefs, and physical characteristics, rather than the traits that are predetermined by their genes. For example, a person's upbringing, education, social environment, and life experiences can all have a significant impact on their personality, values, and choices. Understanding the interplay between nature and nurture is essential to comprehending human development and behavior.