| 单词 | spontaneous mutation |
| 释义 | spontaneous mutationspontaneous mutation[spän′tā·nē·əs myü′tā·shən]spontaneous mutationspon·ta·ne·ous mu·ta·tionspon·ta·ne·ous mu·ta·tion(spon-tā'nē-ŭs myū-tā'shŭn)spontaneous mutationa MUTATION occurring in the absence of a known mutagen. In humans, a typical rate of spontaneous mutation is between 1× 10-5 and 1×10-6 mutations per gamete formed. The rate varies considerably between different organisms, perhaps reflecting different DNA repair systems at work. |
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