Brendgen was investigating physical AND social aggression

• True

• False

Brendgen used both MZ and DZ twins in her study

• True

• False

How old were the twins when data for this study was collected?

• 2

• 4

• 6

• 8

How did Brendgen collect ratings from teachers on the child's physical and social aggression?

How did Brendgen collect ratings from the children's peers about their physical and social aggression?

Which type of aggression was found to have high concordance between MZ twins?

• Physical aggression

• Social aggression

Brendgen suggested that physical aggression could lead to social aggression

• True

• False

Who was rated as more aggressive?

• Girls

• Boys

The research suggests that overall there is a strong genetic influence on...

• Social aggression

• Physical aggression

• Neither type of aggression

The ________ of the study can be considered strong as there were standardised measures of aggression ratings e.g. pre school behaviour rating scales and descriptive ratings of aggression for teachers