Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Genetic influence refers to the role that genes play in shaping an individual's traits or characteristics. It is the impact of genetics on various aspects of an individual's physical and psychological makeup.
Heritability refers to the extent to which differences in a trait can be attributed to genetic factors. For example, if intelligence has a high heritability, it means that genetics play a significant role in explaining differences in intelligence among individuals.
DNA (Deoxyribonucleic acid) is the molecule that carries genetic information in all living organisms. It serves as a blueprint for building and maintaining our bodies, including influencing our cognitive abilities like intelligence.
Twin studies are research studies conducted with twins to examine the relative contributions of genetics and environmental factors on specific traits. By comparing identical twins (who share 100% of their genes) with fraternal twins (who share only 50% of their genes), researchers can estimate how much genetic influence there is on certain traits like intelligence.