一、目前生物學中的生物分類,較為普遍使用的是三域六界(threedomains,sixkingdoms) 的分類。請回答三域為何?六界為何?(10%)

3.escribe the basic principles of CRISPR/Cas9 genome editing, and explain how DNA repair pathways influenceexperimental outcomes in gene function studies.In addition, provide at least two examples of biomedical research or clinical applications of this technology. (5pt)