Why are studies with twins useful in psychology?

• A. They allow researchers to “control” for genetics or the environment.
• B. They allow researchers to work with twice as many subjects.
• C. They allow researchers to have a control group.
• D. They allow researchers to have an experimental group.

Answer: (A)

Verified step by step guidance

1. Understand the concept of twin studies: Twin studies are a type of genetic research used to determine the influence of genetics and environment on human traits and behaviors.
2. Identify the types of twins: Monozygotic (identical) twins share 100% of their genes, while dizygotic (fraternal) twins share about 50% of their genes, similar to regular siblings.
3. Recognize the purpose of twin studies: By comparing similarities and differences between monozygotic and dizygotic twins, researchers can estimate the relative contributions of genetic and environmental factors.
4. Consider the control for genetics: Since identical twins have the same genetic makeup, any differences in traits or behaviors can be attributed to environmental factors, allowing researchers to 'control' for genetics.
5. Evaluate the control for environment: If twins are raised in different environments, researchers can assess how different environments impact traits, providing insights into environmental influences.