遗传漂变KaKs分析与纯化选择htv-2ω = dN/dS, the ratio of nonsynonymous/synonymous substitution rates迈克尔哈内克dN/dS就是Ka/Ks,⾮同义替换率/同义替换率赵凌子ω < 1 的区域:negative purifying selection (负向)纯化选择;⾮同义替换率⼩于同义替换率,此时⼤多数⾮
北京市西城区2021届英语八上期末模拟学业水平测试试题(二)一、选择题1.Don’t worry. He is ______ do his homework.A.too strong to B.strong enough to C.enough strong to D.strong to民国时期学生装2.The litt
Unit 1 The Changing WorldTopic 1 China has developed rapidly in recent years.A卷Section A【课前预习】用所给动词的适当形式填空1. I ____ never ____ (speak) to a foreigner.2. –Has ____ Tom ____ (return) the library book?&n
Unit3 单元测试卷Ⅰ.单选1. —Could you please help me with my English this weekend?—Sorry, I ________. I have something important to do.A. can’t B. Mustn’t C. needn’t &nbs
Unit 3一、单项选择。( )1. ---How long will it ______ us to get to the town by _________ underground?---About half an hour. A. spend, the B. spend, / C. take, /&n