Pat is, biologically, a male and likes to play with trucks. the "maleness" is characteristic of pat's _____, and playing with trucks is characteristic of his _____.
The "maleness" is characteristic of Pat's sex, and playing with trucks is characteristic of his gender. Sex is a term used to describe the biological chromosome status of a given individual. It is scientific in nature and you are born with your sex. Gender is a term that is based on cultural identity.