it could not have arisen by evolution and provides evidence of intelligent desig
ID: 143286 • Letter: I
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it could not have arisen by evolution and provides evidence of intelligent design. Discuss this proposal. 3. The presence of DNA molecules in mitochondria and chloroplasts has led to the suggestion that these organelles are the relics of free-living bacteria that formed a symbiotic association with the precursor of the eukaryotic cell. But these DNA molecules contain, at most, a few hundred genes, compared to thousands of genes in a typical bacterium. Does this discrepancy in gene number suggest that the endosymbiont theory is incorrect? 4. Can viruses be considered a form of life? . In the early nineteenth century, biologists realized that structures as seemingly dissimilar as a human arm, a whale's flipper and the wing of a bird are all constructed from the same set of bones. Can this principle of homology be extended to biomolecules?Explanation / Answer
3. No, this is not the discrepancy in the endosymiotic theory. The mitochondria or chloroplasts we see today were not the bacteria but their prime form, let say two billion years ago. Mitochondria or chloroplasts are thought to be evolved since then and are expected to have lost more than 2000 genes to nucleus.
These organelles have mostly coding DNA (less redundant) while nucleus has lot nong coding regions. Through the course of evolution, these organelles have lost major part of its genome while retaining the essential one.
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