Grace has schizophrenia. Which figure offers the BEST rough estimate of the likelihood that her identical twin Joy will also have schizophrenia?

Question

Quizplus · Accepted Answer

Studies have shown that if one identical twin has schizophrenia, the likelihood of the other twin also having schizophrenia is approximately 50%. Identical twins share nearly all of their genes, which makes them a key demographic for studying the heritability of diseases and disorders. However, the fact that the concordance rate is not 100% also indicates that environmental factors play a role in the development of schizophrenia.

Grace Has Schizophrenia