Gender-Typed/Typing: As children get older they learn about themselves, who they are, how they are "supposed to act", and what is appropriate gender-specific behavior. Gender typing is when children acquire these masculine and/or feminine roles and identify with these roles. There are different degrees to which children exhibit these roles, but we do exhibit masculine or feminine traits, which is gender-Typed/typing.

The form noun+"-type" indicates a form, archetype, or example of something. "Gender-typed behavior" would be manners or bearing according to gender. The sentence actually explains what it means.