A person who believes that members of another ethnic group are hostile and unfriendly will probably treat people in that group in ways that will actually provoke the hostile and unfriendly responses that the person originally expected, which illustrates a

A study by Plomin (1998) found that a variant of a particular gene accounted for about ______ of the variation in IQ scores

a. 2% c. 75% b. 50% d. 10%

Ashley has been studying for the SATs and worrying about doing badly for over two months. She carries vocabulary flash cards and sheets of math problems everywhere. She has not been sleeping well, and this morning she felt a bad cold coming on. Ashley is

A) unrealistic expectations. B) "senior-itis." C) chronic stress. D) hypochondria.