Answer:
schizophrenia
Explanation:
According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question identical twins have a dramatically increased chance of both being affected by schizophrenia. Neurologists agree that in identical twins if one has schizophrenia the other twin has a 50% chance of having the same affliction. While in fraternal twins this percentage is reduced to 15% since they do not share the same placenta or complete DNA.
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