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Fraternal (Dizygotic) Twins in AP Psychology

Verified for the 2027 exam
Verified for the 2027 exam•Fiveable Content Team

Definition

Fraternal twins are siblings who develop from separate fertilized eggs. They share half their genes just like any other siblings but they share womb environment at the same time.

This definition is part of Fiveable's AP Psychology review, which also has guided practice questions.

AP course connection

Topic 2.1: Interaction of Heredity and Environment

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Unit 2

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