The twin study method examines the relative effects of heredity and environment on behaviour and ability by comparing
A) brothers with sisters to fraternal twins.
B) fraternal twins with ordinary siblings.
C) monozygotic twins and dizygotic twins.
D) identical twins with ordinary siblings.

Question

Quizplus · Accepted Answer

The twin study method compares the differences between monozygotic (identical) twins who share all of their genes and dizygotic (fraternal) twins who share only 50% of their genes, while also living in similar environments. This allows researchers to determine the relative contribution of heredity versus environment on different behaviours and abilities.

The Twin Study Method Examines the Relative Effects of Heredity