Family studies, twin studies and adoption studies are primarily designed to

A) disentangle the effects of genetics and experience on behavioural traits.
B) establish the groundwork for genetic engineering programmes.
C) demonstrate the empirical nature of psychological research.
D) assess the effects of modern child-rearing methods.

Twin Studies

Research studies that compare the similarities and differences between monozygotic (identical) and dizygotic (fraternal) twins to understand genetic and environmental influences.

Adoption Studies

Adoption studies are research methods in psychology and genetics that compare biologically related individuals raised apart from their biological families to those raised within them, to understand the influence of environment and genetics.

Genetic Engineering

The manipulation of an organism's genes using biotechnology to create desired phenotypes or to eliminate undesired traits.