The concordance rate for schizophrenia among identical, or monozygotic (MZ), twins is .50; the concordance rate for schizophrenia in fraternal, or dizygotic (DZ) twins, is only .18. Explain what these numbers mean. Include a discussion of nature and nurture in your response.
What will be an ideal response?
This concordance rate means that if one MZ twin has schizophrenia, there is a 50% chance that the other twin will also develop this disorder, whereas there is only a 18% chance of a fraternal twin developing schizophrenia if the other fraternal twin has it. The higher rate for identical twins means that there is a genetic component (nature) to schizophrenia. However, there is still a 50% chance of the second identical twin not having schizophrenia, so environment (nurture) plays a greater role than genes do.
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