key concept the current tree of life has three domains
DESCRIPTION
KEY CONCEPT The current tree of life has three domains. Plantae. Animalia. Classification is always a work in progress. . The tree of life shows our most current understanding. New discoveries can lead to changes in classification. Until 1866: only two kingdoms, Animalia and Plantae. - PowerPoint PPT PresentationTRANSCRIPT
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17.4 Domains and Kingdoms
KEY CONCEPT The current tree of life has three domains.
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17.4 Domains and Kingdoms
Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification.
– Until 1866: only two kingdoms,Animalia and Plantae
AnimaliaPlantae
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17.4 Domains and Kingdoms
Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification.
– Until 1866: only two kingdoms,Animalia and Plantae
– 1866: all single-celled organisms moved to kingdom Protista
AnimaliaProtista
Plantae
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17.4 Domains and Kingdoms
Classification is always a work in progress. • The tree of life shows our most current understanding. • New discoveries can lead to changes in classification.
– Until 1866: only two kingdoms,Animalia and Plantae
– 1938: prokaryotes moved to kingdom Monera
– 1866: all single-celled organisms moved to kingdom Protista
AnimaliaProtista
Plantae
Monera
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17.4 Domains and Kingdoms
• The tree of life shows our most current understanding. • New discoveries can lead to changes in classification.
– Until 1866: only two kingdoms,Animalia and Plantae
Classification is always a work in progress.
– 1938: prokaryotes moved to kingdom Monera
– 1866: all single-celled organisms moved to kingdom Protista
Monera– 1959: fungi moved to own kingdom
Fungi
Protista
PlantaeAnimalia
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17.4 Domains and Kingdoms
• The tree of life shows our most current understanding. • New discoveries can lead to changes in classification.
– Until 1866: only two kingdoms,Animalia and Plantae
Classification is always a work in progress.
– 1938: prokaryotes moved to kingdom Monera
– 1866: all single-celled organisms moved to kingdom Protista
– 1959: fungi moved to own kingdom
– 1977: kingdom Monerasplit into kingdoms Bacteria and Archaea
AnimaliaProtista
Fungi
Plantae
Archea
Bacteria
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17.4 Domains and Kingdoms
The three domains in the tree of life are
Bacteria, Archaea, and Eukarya.• Domains are above the kingdom level.
– proposed by Carl Woese based on rRNA studies of prokaryotes
– domain model more clearly shows prokaryotic diversity
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17.4 Domains and Kingdoms
– known for living in extreme environments
– Cells do not have a nucleus
• Domain Archaea includes prokaryotes in the kingdom Archaea.
– cell walls chemically different from bacteria
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17.4 Domains and Kingdoms
• Domain Bacteria includes prokaryotes in the kingdom Bacteria.– one of largest groups
on Earth– classified by shape,
need for oxygen, and diseases caused
– Cells to not have a nucleus
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17.4 Domains and Kingdoms
• Domain Eukarya includes all eukaryotes. Their cells have a nucleus.
– kingdom Protista usually single celled are like plants,
animals and fungi but simpler
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17.4 Domains and Kingdoms
• Domain Eukarya includes all eukaryotes.
– kingdom Protista– kingdom Plantae multicellular producers cell walls-cellulose
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17.4 Domains and Kingdoms
• Domain Eukarya includes all eukaryotes.
– kingdom Protista– kingdom Plantae– kingdom Fungi usually multicellular consumers cell walls-chitin
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17.4 Domains and Kingdoms
• Domain Eukarya includes all eukaryotes.
– kingdom Protista– kingdom Plantae– kingdom Fungi– kingdom Animalia multicellular consumers no cell walls
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17.4 Domains and Kingdoms
• Bacteria and archaea can be difficult to classify.
– transfer genes among themselves outside of reproduction
– blurs the linebetween “species”
– more researchneeded tounderstand prokaryotes
bridge to transfer DNA