This questions are from Evolution class 1. In a short answer: What does the evidence point...

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Biology

This questions are from Evolution class
1. In a short answer: What does the evidence point to as theancestors of eukaryotes? How did eukaryotes form? Your answer
2. Mitochondria have their own Genes; in humans, only 13 genes.What is significant about this related to evolutionary origin ofmitochondria AND why might be an ecological/evolutionary reason forthere be so few mitochondrial Genes?
3. What is the principle of the selfish gene and how is ourcommon way of framing genetics a skyhook?

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The eukaryotes developed at least 27 billion years ago following some 1 to 15 billion years of prokaryotic evolution Studies of their DNA sequences indicate that the archaebacteria and eubacteria are as different from each other as either is from presentday eukaryotes Eukaryotes are believed to have formed from the divergence of three lines of descent from a common ancestor giving rise to archaebacteria eubacteria and eukaryotes Interestingly many archaebacterial genes are more similar to those of eukaryotes than to those of eubacteria indicating that the archaebacteria and eukaryotes share a common line of evolutionary descent and are more closely related to each other than either is to the eubacteria A critical step in the evolution of eukaryotic cells was the acquisition of membraneenclosed subcellular organelles allowing the development of the complexity characteristic of these cellsThe hypotheses that eukaryotic cells evolved from a symbiotic association of prokaryotesendosymbiosiswhich are thought to have evolved from bacteria living in large cells Mitochondria and chloroplasts contain their own DNA which encodes some of their components The mitochondrial and chloroplast DNAs are See Answer

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