Final answer:
Sex-typed behavior emerges in early childhood, typically by preschool age, and boys and girls tend to segregate in their play during childhood.
Step-by-step explanation:
Sex-typed behavior emerges in early childhood, typically by preschool age, while boys and girls tend to segregate in their play during childhood. Children learn about distinct expectations for boys and girls from a young age through socialization. They acquire gender roles through societal values, beliefs, and attitudes, and are usually firmly entrenched in culturally appropriate gender roles by the age of four or five.