Question

pat is normally very restless and fidgety, whereas shelley is usually quiet and easygoing. the two children most clearly differ in 1) sex chromosomes. 2) gender schemas. 3) temperament. 4) gender roles.

Explanation:

Temperament refers to innate differences in reactivity and self - regulation. Pat's restlessness and fidgetiness versus Shelley's quiet and easy - going nature are characteristic of differences in temperament. Sex chromosomes determine biological sex, gender schemas are cognitive frameworks about gender, and gender roles are cultural expectations related to gender, none of which are described here.

Answer:

1. temperament.