Broad categories that reflect general impressions and beliefs about males and females, such as "math is for boys and reading is for girls," that then set up expectations that all boys should be good at math and any boy who likes to read is feminine, are known as gender:

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These are known as gender stereotypes, which are oversimplified and widely held beliefs about the characteristics and behaviors of males and females.

Broad Categories That Reflect General Impressions and Beliefs About Males