biology help please??????????????

Biology
Tutor: None Selected Time limit: 1 Day

The first eukaryotic cell did not appear until 2.5 billion years ago approximately.  We know this because of the fossil record.  How did those first eukaryotic cells get here?  What are your ideas concerning the evolution of the first eukaryotic cells?  Do not concern yourself with how life first formed, rather just concern yourself with how eukaryotic cells first evolved.  Please look at this from a scientific standpoint and not a religious point of view.

Sep 9th, 2015

Thank you for the opportunity to help you with your question!

Clearly, eukaryotic history goes back far into the era when the earth's atmosphere contained little or no oxygen, well over two billion years ago. Our current concept of the origin of the eukaryotic cell is in flux, however, and an evolutionary sequence that appears simple when conceptualized on a phylogenetic tree diagram may be far more complex and interesting in reality. We know that the eukaryotic cell is of ancient origin, but we do not yet know the evolutionary dynamic that underlies its formation.

Eukaryotic cells originated more than 0.6 billion years ago. The mitochondria (and plastids) of extant eukaryotic cells are remarkably similar suggesting aerobic bacteria (or cyanobacteria) were incorporated on only one occasion each. We might assume that the evolution of the Eukaryotic cell was a most unusual event because an amazing array of other cellular characteristics has evolved over the same period.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Sep 9th, 2015

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Sep 9th, 2015
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Sep 9th, 2015
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