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HomeHomework HelppsychologyTwin Studies

Twin Studies

Twin studies are research designs that compare the similarities and differences between identical (monozygotic) and fraternal (dizygotic) twins to investigate the relative contributions of genetics and environment to various traits and behaviors. These studies are key in understanding the heritability of psychological and physical characteristics.

intermediate
2 hours
Psychology
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Overview

Twin studies are a vital research method in psychology and genetics that help scientists understand the interplay between genetics and environment. By comparing identical twins, who share all their genes, with fraternal twins, who share about half, researchers can estimate the heritability of variou...

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Key Terms

Monozygotic Twins
Twins that develop from a single fertilized egg and share 100% of their genes.

Example: Identical twins are monozygotic.

Dizygotic Twins
Twins that develop from two separate eggs fertilized by two different sperm, sharing about 50% of their genes.

Example: Fraternal twins are dizygotic.

Heritability
A measure of how much of a trait's variation is due to genetics.

Example: Heritability of height is high, indicating genetics play a significant role.

Nature vs. Nurture
The debate over the relative contributions of genetics (nature) and environment (nurture) to human behavior.

Example: Twin studies often explore this debate.

Behavioral Genetics
The field of study that examines the role of genetics in behavior.

Example: Behavioral genetics uses twin studies to understand personality.

Environmental Factors
External influences that can affect an individual's development and behavior.

Example: Family upbringing is an environmental factor.

Related Topics

Genetic Research
Explores the methods and findings in the study of genetics.
intermediate
Psychological Disorders
Examines various mental health conditions and their treatments.
intermediate
Developmental Psychology
Studies how people grow and change throughout life.
intermediate

Key Concepts

GeneticsEnvironmentHeritabilityBehavioral Traits