Three domains vs 5 Kingdoms Watch

Chunkeymonkey62
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#1
Anyone like to tell me the differences and comparisons etc?

Thanks TSR! :p:
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SALLIUS
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This link should explain all in good detail: http://www.biology.iupui.edu/biocour...k23domain.html
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ali242
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5 kindoms: observation based
plantae
animalia
protoctista
prokaryota
fungi

3 domains: more DNA based
bacteria
eukarya
archae
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ViolinGirl
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Three domains were created, as new evidence became available, which showed that there were funamental differences between between some bacteria, so prokayotes made into bacteria and arcahea. Differences include membrane structure, RNA differences...
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blackmarauder
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From my book:

In the older, five kingdom system of classification, all organisms are placed into one of five kingdoms.

In the new, three domain system all organisms are placed into one of three domains - large superkingdoms that are above the kingdoms in the taxonomic hierarchy.

Organisms that were in the kingdom Prokaryotae (unicellular organisms without a nucleus) are separated into two domains- the Archaea and Bacteria. Organisms from the other four kingdoms (organisms with cells that contain a nucleus) are placed in the third domain- Eukarya.

The Prokaryotae were reclassified into two domains because molecular phylogeny suggested that archaea and bacteria are more distantly related than originally thought.

And as ali242 pointed out, the older system was more physiologically based. The new system used molecular phylogeny which looks at actual molecules (DNA + Proteins) to see how closely related organisms are, e.g. more closely related organisms have more similar molecules.

Hope this helps!
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lolchan
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ur g
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nadialaura
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Amazing, thanks
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nadialaura
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(Original post by blackmarauder)
From my book:

In the older, five kingdom system of classification, all organisms are placed into one of five kingdoms.

In the new, three domain system all organisms are placed into one of three domains - large superkingdoms that are above the kingdoms in the taxonomic hierarchy.

Organisms that were in the kingdom Prokaryotae (unicellular organisms without a nucleus) are separated into two domains- the Archaea and Bacteria. Organisms from the other four kingdoms (organisms with cells that contain a nucleus) are placed in the third domain- Eukarya.

The Prokaryotae were reclassified into two domains because molecular phylogeny suggested that archaea and bacteria are more distantly related than originally thought.

And as ali242 pointed out, the older system was more physiologically based. The new system used molecular phylogeny which looks at actual molecules (DNA + Proteins) to see how closely related organisms are, e.g. more closely related organisms have more similar molecules.

Hope this helps!
That's great thanks!
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