"Raised apart" refers to identical twins being separated at birth or during infancy intentionally or unintentionally. This separation results in them growing up in different environments with potentially distinct experiences, families, and surroundings.
Related terms
Nature vs. Nurture: The ongoing debate about how much of human behavior is influenced by genetic factors (nature) versus environmental factors (nurture).
Developmental Psychology: The study of changes in behavior and abilities throughout the lifespan, including physical, cognitive, social, and emotional development.
Epigenetics: The study of heritable changes in gene expression caused by mechanisms other than changes to the underlying DNA sequence.