Archaea

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The fact that Archaea seem to be closer to Eukarya than to Eubacteria, means it is not unlikely that the group is [[paraphyletic]], with ancestral "[[urkaryote]]s" and/or eukaryotes evolving from archaean ancestors.
The fact that Archaea seem to be closer to Eukarya than to Eubacteria, means it is not unlikely that the group is [[paraphyletic]], with ancestral "[[urkaryote]]s" and/or eukaryotes evolving from archaean ancestors.
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For more on Archaea, see the following pages:
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==The phylogenetic and systematic relationship of Eukaryota, and Archaea.==
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The [[protein]] [[DNA|coding-genes]] (Conservative) of Eukarya has distinctive subsets of which a few appear to derive from Archaea, whereas only one derives from endosymbiotic relationships. The relationship however, remains a mystery. The origin of Eukaryotes is a hotly argued theme in biology. The debate has lead to many hypotheses on the topic, each with different scenarios to explain the origin of eukaryotes (''Yutin, Makarova, et. al.). There are uncertainties, like the presence of archaeal-like genes in certain bacterias.
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==Notes==
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* ''The Deep Archaeal Roots of Eukaryotes
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Natalya Yutin, Kira S. Makarova, Sergey L. Mekhedov, Yuri I. Wolf, and Eugene V. Koonin
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National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD:
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"The set of conserved eukaryotic protein-coding genes includes distinct subsets one of which appears to be most closely
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related to and, by inference, derived from archaea, whereas another one appears to be of bacterial, possibly,
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endosymbiotic origin. The ‘‘archaeal’’ genes of eukaryotes, primarily, encode components of information-processing
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systems, whereas the ‘‘bacterial’’ genes are predominantly operational. The precise nature of the archaeo–eukaryotic
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relationship remains uncertain,..." Journal of Molecular Biology and Evolution''
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'''Credits''' CKT060920, modified MAK060628
'''Credits''' CKT060920, modified MAK060628

Latest revision as of 10:39, 13 August 2013

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