The major lineages of life
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THE MAJOR LINEAGES OF LIFE. MRS. SANDY GOMEZ. Taxonomy Schemes. Two K ingdom S ystem (Carl Linnaeus ) Five Kingdom System (Robert Whittaker ) Three Domain System ( Carl Woese ). THE TWO KINGDOM SYSTEM. Initially used by Linneus Divided all life forms into : Plants Animals.

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THE MAJOR LINEAGES OF LIFE

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The major lineages of life

THE MAJOR LINEAGES OF LIFE

MRS. SANDY GOMEZ


Taxonomy schemes

TaxonomySchemes

  • TwoKingdomSystem(Carl Linnaeus)

  • FiveKingdomSystem(Robert Whittaker)

  • ThreeDomainSystem (Carl Woese)


The two kingdom system

THE TWO KINGDOM SYSTEM

  • Initiallyused by Linneus

  • Dividedalllifeformsinto:

    • Plants

    • Animals


The two kingdom system1

THE TWO KINGDOM SYSTEM


The five kingdom system

THE FIVE KINGDOM SYSTEM

  • Initiallyused by Robert H. Whittaker

  • He dividedorganismsinto 5 kingdoms, accordingtotheirtype of cell, eatinghabits and movement.

  • Recognizedthetwotypes of cells:

    • Prokaryotes (1 kingdom)

    • Eukaryotes (4 kingdoms)


The five kingdom system1

THE FIVE KINGDOM SYSTEM


The five kingdom system2

THE FIVE KINGDOM SYSTEM

  • According to Linneaus:

    • Plants are autotrophic in nutritional mode, making their food by photosynthesis.

    • Fungi are heterotrophic organisms that are absorptive in nutritional mode. Most fungi are decomposers.

    • Animals live by ingesting food and digesting it within specialized cavities.

    •  Protista consisted of all eukaryotes that did not fit the definition of plants, fungi, or animals. Most of them are unicellular.


The five kingdom system3

THE FIVE KINGDOM SYSTEM

  • Like any classification scheme, the five-kingdom system is not a natural fact but a human construct.

  • Is one attempt to order the diversity of life into a scheme that is useful and reasonable. 

  • But, eventually, pointed out some problems:

    • There are two distinct lineages of prokaryotes.

    • The diverse eukaryotes formerly collected in the kingdom Protista.


The three domain system

THE THREE DOMAIN SYSTEM

  • Introducedby Carl Woese

  • The three domains, are essentially super-kingdoms, a taxonomic level even higher than the kingdom level.

    • Bacteria

    • Archaea

    • Eukarya

  • Scheme that is used today

  • Schemes change with new scientific discoveries


The three domain system1

THE THREE DOMAIN SYSTEM


Thanks for your attention

THANKS FOR YOUR ATTENTION!


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