Your text reveals that if one identical twin is gay,there is almost a 50 percent chance that the other identical twin will also be gay.On the other hand,if a fraternal twin is schizophrenic,there is only about a 20 percent chance the other fraternal twin will be schizophrenic.The measure of likelihood that twins will share this mental illness in common is called a(n)

Question

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The measure of likelihood that twins will share a trait or disorder in common is called the concordance rate. The example given in the text shows a higher concordance rate for homosexuality among identical twins (around 50%), compared to the concordance rate of schizophrenia among fraternal twins (around 20%). Therefore, the best choice is A - concordance rate. The other options (B, C, and D) are not relevant to the context of the question or do not accurately reflect the measure of likelihood for twin studies.

Your Text Reveals That If One Identical Twin Is Gay,there