By Richard Johnston
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Eukaryotic cells comprise a plurality of organelles exotic via their particular membranes and contents. Their biogenesis happens by means of development and department of preexisting constructions instead of de novo. Mitochondria and chloroplasts, which seem to be descended from prokaryotic ancestors, have retained a few DNA and the biosynthetic power for its expression.
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Extra info for Evolution - fact or fable
1 New evidences suggest that the human race is very young. The journal Science reported that the age of the human race is roughly 1,000 to 10,000 generations. Other information about mitochondrial DNA mutation rates gives an even younger age than 1,000 generations. Age estimates are obtained by observing differences between the DNA of different individuals and calculating the time of divergence using estimates of mutation rates. Mitochondrial DNA is often used, since it is separate from the bulk of DNA found in the cell nucleus.
Along with the rocks, the animals and plants deposited are now found fossilized in the strata. Due to the flood, simpler creatures would have been drowned first as the waters began to rise, while more complex ones would have struggled for survival longer and sought out higher ground. This explains why the simpler life forms were buried in the deepest strata. indd 33 12/11/2002, 12:50:07 PM 34 evolution: fact or fable? found around the world. Several in North America have been carefully examined.
After 66 generations, two randomly chosen humans will differ by about four mutations. After 100 generations, they will differ by about six mutations. After 300 generations, they will differ by about 18 mutations, the typically observed value in humans today. indd 46 12/11/2002, 12:50:09 PM evolution: fact or fable? 47 irreducibility T he theory of evolution postulates that small, incremental, beneficial steps propel the evolutionary process forward. It is much like a device where one component of that device is modified at a time, so as to improve the efficiency of the device in some way, while at the same time allowing the device to remain functioning without any other modifications.