Building the Tree of Life
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- Mildred Bradford
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1 18.3 Building the Tree of Life
2 Changing Ideas About Kingdoms This diagram shows some of the ways in which organisms have been classified into kingdoms since the 1700s.
3 Three Domains Genetic analysis has revealed that the two main prokaryotic kingdoms are more different from each other, and from eukaryotes, than previously thought. So, biologists established a new taxonomic category the domain. A domain is a larger, more inclusive category than a kingdom. Under this system, there are three domains domain Bacteria (corresponding to domain Eubacteria), domain Archaea (corresponding to kingdom Archaebacteria), and domain Eukarya (corresponding to kingdoms Fungi, Plantae, Animalia, and kingdom Protista ). Quotes are put around kingdom Protista to indicate that it is not a monophyletic group.
4 Three Domains
5 The Tree of All Life Modern evolutionary classification is a rapidly changing science with the difficult goal of presenting all life on a single evolutionary tree. The tree of life shows current hypotheses regarding evolutionary relationships among the taxa within the three domains.
6 The Tree of All Life
7 Domain Bacteria Members of the domain Bacteria are unicellular and prokaryotic. This domain corresponds to the kingdom Eubacteria. Their cells have thick, rigid walls that surround a cell membrane and contain a substance known as peptidoglycan. These bacteria are ecologically diverse, ranging from free-living soil organisms to deadly parasites. Some photosynthesize, while others do not. Some need oxygen to survive, while others are killed by oxygen.
8 Domain Archaea The domain Archaea corresponds to the kingdom Archaebacteria. Members of the domain Archaea are unicellular and prokaryotic, and they live in some extreme environments in volcanic hot springs, brine pools, and black organic mud totally devoid of oxygen. Many of these bacteria can survive only in the absence of oxygen. Their cell walls lack peptidoglycan, and their cell membranes contain unusual lipids that are not found in any other organism.
9 Domain Eukarya The domain Eukarya consists of all organisms that have a nucleus. It comprises the four remaining kingdoms of the six-kingdom system: Protista, Fungi, Plantae, and Animalia.
10 The Protists : Unicellular Eukaryotes The kingdom Protista has long been viewed by biologists as a catchall group of eukaryotes that could not be classified as fungi, plants, or animals. Recent molecular studies and cladistic analyses have shown that the eukaryotes formerly known as Protista do not form a single clade. Current cladistic analysis divides these organisms into at least five clades. Since these organisms cannot be properly placed into a single taxon, we refer to them as protists.
11 The Protists : Unicellular Eukaryotes Most protists are unicellular, but one group, the brown algae, is multicellular. Some protists are photosynthetic, while others are heterotrophic. Some display characters that resemble those of fungi, plants, or animals.
12 Fungi Members of the kingdom Fungi are heterotrophs with cell walls containing chitin. Most fungi feed on dead or decaying organic matter. They secrete digestive enzymes into their food source, which break the food down into smaller molecules. The fungi then absorb these smaller molecules into their bodies. Mushrooms and other recognizable fungi are multicellular, like the ghost fungus shown. Some fungi yeasts, for example are unicellular.
13 Plantae Members of the kingdom Plantae are multicellular, have cell walls that contain cellulose, and are autotrophic. Autotrophic plants are able to carry on photosynthesis using chlorophyll. Plants are nonmotile they cannot move from place to place. The entire plant kingdom is the sister group to the red algae, which are protists. The plant kingdom, therefore, includes the green algae along with mosses, ferns, cone-bearing plants, and flowering plants.
14 Animalia Members of the kingdom Animalia are multicellular and heterotrophic. Animal cells do not have cell walls. Most animals can move about, at least for some part of their life cycle. There is incredible diversity within the animal kingdom, and many species of animals exist in nearly every part of the planet.
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