In “Gender Confusion: Where Does Biology End and Society Take Over?” Deborah Blum states that “our culture's gender roles reflect an underlying biology” (Blum 679). Maasik and Solomon argue that gender codes and behaviors “are not the result of some sort of natural or biological destiny, but are instead politically motivated cultural constructions” (620), raising the question of whether gender behavior begins in culture or in genetics. While it can be argued that gender roles begin either in nature or nurture, many believe that both culture and biology have an influence on behavior. Today's world revolves around a patriarchal society where it is a man's world. Men are stereotyped to take jobs such as manual labor, construction, and the military, while women are stereotyped to become nurses, carers, and cooks; but what makes you say that a woman cannot do manual labor or be a construction worker? Marc Breedlove, a behavioral endocrinologist at the University of California at Berkley, explains that gender roles “are too big to be explained simply by society” (679). These gender differences in behavior reach far beyond our culture and seep into our genetics through Darwin's theories of natural selection, survival of the fittest, and evolution. When we talk about evolution, we do not state that man derives from ape but rather that man evolves and adapts to his environment and his environment due to natural selection. In caveman times, men hunted while women were caretakers and cooks. Since humans were hunters, they grew bigger, faster, and stronger to have better hunting skills, which were essential for survival. These men passed down these “mastered traits – a certain flexibility, an instinctive ability to respond to… middle of paper… drives. There are boys in the mountain villages of the Dominican Republic who lack testosterone and “are usually raised as 'conditioned' girls” (681). Once these boys reach puberty, “the family passes the child from daughter to son. The clothes are thrown away. He starts wearing men's clothes and starts dating girls” (681). These boys, also known as “guevedoces,” display biological characteristics that manifest themselves in later stages of life rather than at birth, which determine gender roles. My cousin, raised by a single father, grew up acting and playing like a boy. She was very aggressive when she was younger, but as she grew up, society and human nature changed her. Not only is she influenced by our culture to act feminine and ladylike, but she is now an adult who wants to have a family and become a mother to have children and survive..