QUESTION TEXT: Wirth: All efforts to identify a gene…
QUESTION TYPE: Main Conclusion
ARGUMENTS: Wirth argues that genes don’t cause manic-depression because no single gene causes manic-depression.
Chang agrees with Wirth’s evidence, but points out that there is evidence that several genes jointly cause manic depression.
ANALYSIS: Chang’s main point is that Wirth is using a restricted definition of “genetic cause.” Multiple genes could be the cause of something.
___________
- CORRECT. Wirth assumes that only a single gene can act as a genetic cause. Chang points out that multiple genes can act together to cause something.
- Chang says he agrees with Wirth’s evidence.
- The genetics experts are definitely within their expertise.
- Wirth never said that no evidence could prove him wrong. And Chang doesn’t accuse Wirth of saying that. Chang just adds new evidence that makes us re-evaluate Wirth’s conclusion.
- Wirth doesn’t say his conclusion is 100% certain. He says it’s only true “if the researchers are right.”
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