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Fruit flies are much more complex than already complex single-cell bacteria.Scientists like to study them because a generation (from egg to adult) takes only 9 days. Here is how the imaginary part is supposed to happen: On rare occasions a mutation in DNA improves a creature's ability to survive, so it is more likely to reproduce (natural selection).
It might even work if it took just one gene to make and control one part.They wrote that "forward experimental evolution can often be completely reversed with these populations". Mutations that result in a gain of novel information have not been observed."Despite decades of sustained selection in relatively small, sexually reproducing laboratory populations, selection did not lead to the fixation of newly arising unconditionally advantageous alleles." "The probability of fixation in wild populations should be even lower than its likelihood in these experiments." --Burke, Molly K., Joseph P. Most long-term evolution experiments thus far have been performed in bacteria or haploid yeast populations, where, in most environments, there exist a number of loss-of-function mutations that provide a selective advantage." "For instance, sterility in yeast provides a selective advantage by eliminating unnecessary gene expression." "The emergence of the Cit phenotype is the exception in experimental evolution, where most evolved mutations affect independent genes and biological pathways, driven largely by large-target loss-of-function mutations."This candid admission is from the evolutionist journal Nature: "Darwin anticipated that microevolution would be a process of continuous and gradual change.A human generation takes about 20 years from birth to parenthood.They say it took tens of thousands of generations to form man from a common ancestor with the ape, from populations of only hundreds or thousands. A new generation of bacteria grows in as short as 12 minutes or up to 24 hours or more, depending on the type of bacteria and the environment, but typically 20 minutes to a few hours.
To evolutionists, this idea has been essential for so long that it is called a "classic sweep", "in which a new, strongly beneficial mutation increases in frequency to fixation in the population."Some evolutionist researchers went looking for classic sweeps in humans, and reported their findings in the journal Science. Lenski is an evolutionary biologist who began a long-term experiment on February 24, 1988 that continues today.