A researcher observes that when one identical twin is diagnosed with schizophrenia, the other twin has a significantly higher chance of also developing the disorder compared to the general population. The researcher concludes that this finding is conclusive evidence that the disorder's development is determined solely by genetic factors. What is the most significant logical flaw in this conclusion?
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A researcher observes that when one identical twin is diagnosed with schizophrenia, the other twin has a significantly higher chance of also developing the disorder compared to the general population. The researcher concludes that this finding is conclusive evidence that the disorder's development is determined solely by genetic factors. What is the most significant logical flaw in this conclusion?
A researcher observes that identical twins, who share 100% of their genes, have a much higher concordance rate for schizophrenia than fraternal twins, who share about 50% of their genes. Both groups of twins in the study were raised together in the same households. The researcher concludes that the difference in risk is almost entirely explained by genetics. What is the most significant flaw in this researcher's reasoning?