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Twin zygosity DNA testing from DNA Bioscience can conclusively determine whether twin siblings are identical twins or fraternal twins. Twins and parents of twins often initiate this type of genetic test to satisfy their personal curiosity. Others initiate twin testing as a safeguard for possible future medical emergencies—identical twins are perfect organ and tissue donors for one another.
Identical twins develop from a single zygote—the union of one egg cell and one sperm cell during conception. Because they come from a single zygote that splits during its early development, identical twins share the same DNA profile.
Fraternal twins develop from two zygotes—two egg cells that were fertilised by two sperm cells. Because they come from two zygotes, fraternal twins have different DNA profiles. Their profiles can be as different as any two non-twin siblings’ profiles can be.
