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Definitions:

Twin Studies

A research method in which researchers assess hereditary influence by comparing the resemblance of identical twins and fraternal twins on a trait.

Hereditary Influences

The impact of genetic factors inherited from parents on an individual's traits, behavior, and health.

Identical Twins

Twins that develop from a single fertilized egg that splits and forms two embryos, sharing 100% of their DNA.

Fraternal Twins

Siblings born at the same time but are the result of two different eggs fertilized by two different sperm, sharing about 50% of their DNA, similar to ordinary siblings.

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