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Are identical twins truly identical?

Dr. Michael Roizen, MD
Internal Medicine
Identical twins get dealt exactly the same DNA, but they may develop different traits down the lineóone may have allergies and the other may not, one may develop a particular disease and the other may not, one may be able to play the piano without ever learning how to read music while the other can't carry a tune with a dump truck. What accounts for these differences is something in their environmentópotentially as early as in uteroóaffected the expression of their genes differently. That something is called epigenetics.
YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

More About this Book

YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

Can I get a cavity filled while pregnant? Will avoiding spicy foods make my kid a picky eater? Can I really increase my baby's IQ while she's in utero? Whether you're pregnant for the first time,...
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
While identical twins share the same genes, they're never truly identical because they may receive different amounts of non-genetic cellular material. In the womb, but even more so after birth and throughout life, identical twins continue to differentiate because they are exposed to different environments, a phenomenon known as "epigenetic drift."
YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

More About this Book

YOU: Having a Baby: The Owner's Manual to a Happy and Healthy Pregnancy

Can I get a cavity filled while pregnant? Will avoiding spicy foods make my kid a picky eater? Can I really increase my baby's IQ while she's in utero? Whether you're pregnant for the first time,...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.