Is the ADA still really using the 5 kingdom classification on the DAT? Has anyone here ever learned that in their college bio course? Every single class I've been in that even touched on taxonomy started off with "NO MORE 5 KINGDOMS!"
Why still 5 kingdoms?
- Thread starter tommyinVA
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Here's what I have for that:
.History:
1) 3 kingdoms
2) 5 kingdoms (Monera, Protista, Fungi, Plantae, Animalia, + (6th kingdom) Archaebacteria)
3) 3-domain system (Bacteria, Archaea, Eukarya)
(based on DNA analysis, reflects evolutionary history)
- Monera is no longer included in this system
- Prokaryotes are now both in two different domains, Archaea and Bacteria
.
There was a progression in history. It used to be 3, then it turned into 5 kingdoms for classification (not sure what the classification was based on). The 3 domains are based on DNA sequencing, I'm assuming.
Today, we use more of the 3 domains, probably after they found out about archaea and that it would be more appropriate. Eukarya includes the original 4 of the kingdoms: Protista, Fungi, Plantae, Animalia. Bacteria and Archaea classify other prokaryotes.
I'm not sure which one ADA chooses to acknowledge, but I think regardless of which one they chose to call it, 5-kingdoms and 3-domain, there still a lot of overlap, and the characteristics especially for Protista, Fungi, Plantae, Animalia have not changed, even though they are now characterized under Eukarya domain.
..
.History:
1) 3 kingdoms
2) 5 kingdoms (Monera, Protista, Fungi, Plantae, Animalia, + (6th kingdom) Archaebacteria)
3) 3-domain system (Bacteria, Archaea, Eukarya)
(based on DNA analysis, reflects evolutionary history)
- Monera is no longer included in this system
- Prokaryotes are now both in two different domains, Archaea and Bacteria
.
There was a progression in history. It used to be 3, then it turned into 5 kingdoms for classification (not sure what the classification was based on). The 3 domains are based on DNA sequencing, I'm assuming.
Today, we use more of the 3 domains, probably after they found out about archaea and that it would be more appropriate. Eukarya includes the original 4 of the kingdoms: Protista, Fungi, Plantae, Animalia. Bacteria and Archaea classify other prokaryotes.
I'm not sure which one ADA chooses to acknowledge, but I think regardless of which one they chose to call it, 5-kingdoms and 3-domain, there still a lot of overlap, and the characteristics especially for Protista, Fungi, Plantae, Animalia have not changed, even though they are now characterized under Eukarya domain.
..
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I don't think the DAT is going to ask any questions on Domains or Kingdoms. It seems like the taxonomy questions start at the Phylum level and go below that, in which case all this domain vs. kingdom is a moot point.
