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Constancy
Refers to the psychological or physical stability or steadiness in a person or environment.
Monozygotic Twins
Identical twins that develop from a single fertilized egg, sharing identical genetic material.
Dizygotic Twins
Also known as fraternal twins, are siblings that develop from two different eggs fertilized by two different sperm, sharing about 50% of their DNA.
Concordance
In genetics, the presence of the same trait in both members of a pair of twins or in both members of a family, indicating genetic influence.