The document explores the concepts of gender and sex, detailing their definitions and importance within developmental psychology, and examines various theories related to gender-typing and gender-role development. It discusses the role of cultural, familial, and societal influences on gender socialization, along with common stereotypes, differences in behavior and abilities between sexes, and recent critiques of these findings. Overall, it underscores that while some measurable differences exist, psychological similarities between genders are generally more pronounced than differences.