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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.