Twin Studies

Identical VS. Fraternal Twins

Identical Twins

They develop from a single fertilized egg that splits in two ands its genes are identical

Fraternal Twins

Develop from separate fertilized eggs, are genetically no more similar than regular brothers and sisters


Identical twins are nature's own human clones. They are clones who share not only the same genes but the same conception, birth date, and sometimes same cultural history.


Fraternal twins can be the same sex or opposite sex. They have 50% shared genes and 50% unique genes.

Identical VS. Fraternal Twins

Fraternal twins are dizygotic, which means that they developed from two different eggs fertilized by two different sperm cells, while identical twins are monozygotic, they developed from a single fertilized egg that split.
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