Dr. Cardinale is interested in the effects of heredity and environment on intelligence. She compares the similarity of IQ scores of identical twins to the similarity of IQ scores of fraternal twins. In this case, Dr. Cardinale is studying heredity influence on behavior using

behavior ginetics

Behavior genetics

Explanation:

Behavioral genetics studies how genetics of the organism influences the behavior of organism.

Here, the doctor knows that the genes of a person affects the organisms behavior. The doctor is trying to find the effects of heredity and environment on intelligence. Identical twins nearly share hundred percent of their DNA while fraternal twins share half their DNA.

This difference in the genetic makeup of the participants will make it easier to find the effects of heredity and environment on intelligence.