A gene whose influence will be expressed only when it is paired with a second gene of the same type is known as a __________ gene

Dr. Smith believes people who are very aggressive have become so because of their life experiences. Dr. Jones believes people are more or less aggressive from birth because of genetic factors. What issue in developmental psychology is highlighted by their disagreement?

a) nature and nurture b) cognition and emotion c) classical and operant conditioning d) cross-sectional studies and longitudinal design

The ability to __________ is rarely present before adolescence

A) sort out evidence that bears on two simple variables B) think about thinking C) actively seek disconfirming evidence D) focus on concrete evidence