Question

Discuss in brief 3 domain classification system.

Answer 1

The three-domain system is a biological classification introduced by Carl Woese et al. in 1977[1][2] that divides cellular life forms into archaea, bacteria, and eukaryote domains

In particular, it emphasizes the separation of prokaryotes into two groups, originally called Eubacteria (now Bacteria) and Archaebacteria (now Archaea). Woese argued that, on the basis of differences in 16S rRNA genes, these two groups and the eukaryotes each arose separately from an ancestor with poorly developed genetic machinery, often called a progenote. To reflect these primary lines of descent, he treated each as a domain, divided into several different kingdoms.