Sarah has an identical twin. Her twin has been diagnosed with a depressive disorder. Given current prevalence rates, Sarah's genetic risk for developing a depressive disorder is

Question

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Identical twins share 100% of their genes. When one identical twin is diagnosed with a depressive disorder, the other twin has a significantly increased risk of also developing the condition compared to the general population. Studies have shown that the concordance rate (the probability that both twins have the condition if one twin has it) for depressive disorders in identical twins can be as high as 45%. This reflects both the genetic and environmental factors contributing to the disorder.

Sarah Has an Identical Twin