What are the three domains of life and indicate which ones w

What are the three domains of life and indicate which ones were the first to evolve. Then describe the theories as to how eukaryotes arose and indicate which theory you support and explain why.

Solution

According to the woese system the tree of life consists of three domains archaebacteria,bacteria and eukaryotes. The first two are all prokaryotic microorganisms or single celled organisms Whose cells have no nucleus. According to the three domain system the eubacterial genes sre more related to archaebacteria. This system best explains the origin of eukaryotes.

But still some scientistslike Mcl nerney etal. reject the view and say that eukaryotes are neither archae lineages nor bacterual but they share both characters just like we share mothers and fathers.