The standard sex and gender model consists of ideologies based on the sex and gender of every individual and serve as "norms" for societal life. The model claims that the sex of a person is the physical body that the individual is born with, strictly existing within a male/female dichotomy giving importance to the genitals and the chromosomes which make the organism male or female. The standard model defines gender as a social understanding/ideology that defines what behaviors, actions, and appearances are proper for males and females living in society.