Name Rania Aziz
Building the Tree of Life
Name the six kingdoms of life as they are currently identified.
Explain what the tree of life represents.
Changing Ideas About Kingdoms
As biologists learned more about the natural
world, they realized that Linnaeus’s two kingdoms, Animalia and Plantae, did not represent
Researchers found that microorganisms were very different from plants and animals. They
were placed in their own kingdom, called Protista.
Then, yeast, molds, and mushrooms were separated from plants and placed in their own
kingdom, called Fungi.
Because bacteria lack nuclei, mitochondria, and chloroplasts, they were separated from
Protista and placed in another new kingdom, called Monera.
In the 1990s, kingdom Monera was divided into two kingdoms: Eubacteria and
Archaebacteria. The six-kingdom system of classification includes the kingdoms
Eubacteria, Archaebacteria, Protista, Fungi, Plantae, and Animalia.
Genetic analysis revealed that two prokaryotic groups are even more different from each
other, and from Eukaryotes, than previously thought. This discovery lead to the creation
of a new taxon, called the domain. The
is a larger, more inclusive category than a