GRE Text Completion Question 237
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Source: XDF
Natural selection tends to eliminate genes that cause inherited diseases, acting most strongly against the most severe diseases; consequently, hereditary diseases that are_____would be expected to be very_____, but, surprisingly, they are not.
| Blank(i) | Blank(ii) |
|---|---|
| A lethal | D perplexing |
| B untreated | E refractory |
| C widespread | F rare |