R
rossum
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Your post is off topic for this thread and is getting perilously close to the banned area. However, your source’s misrepresentation of the science cannot be left unanswered.
Here is some more of what the paper says:
rossum
Have you read the actual paper or have you just read the filleted version put out by a creationist source? You need to look at the original paper; creationist sources have a distressing tendency to omit or to misunderstand science.Darwinian theory falsified, yet again. That paper is the conclusion to a 30 year study of fruit fly evolution. Researchers conclude that unconditionally advantageous alleles are not fixed in a population, and the ‘classic sweep’ of selection for a trait does not occur.
The researchers even enhanced the experiment by artificially selecting for optimum results. Lab conditions also provide a constant environment. The scientists observe that in the wild, results will show even fewer advantageous mutations evolving the population.
From the paper:
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. This is notable because in wild populations we expect the strength of natural selection to be less intense and the environment unlikely to remain constant for,600 generations. Consequently, the probability of fixation in wild populations should be even lower than its likelihood in these experiments. This suggests that selection does not readily expunge genetic variation in sexual populations, a finding which in turn should motivate efforts to discover why this is seemingly the case
We conclude that, at least for life history characters such as development time, unconditionally advantageous alleles rarely arise, are associated with small net fitness gains or cannot fix because selection coefficients change over time.
Here is some more of what the paper says:
So, we have evolution. The flies are now developing 20% faster than they used to. Let us read further:Here we present whole-genome resequencing data from Drosophila melanogaster populations that have experienced over 600 generations of laboratory selection for accelerated development. Flies in these selected populations develop from egg to adult ~20% faster than flies of ancestral control populations, and have evolved a number of other correlated phenotypes.
Has Darwinian evolution been falsified? No. These scientists were looking at which specific mechanism of evolution was operating: ‘classic sweep’, ‘incomplete sweep’ or ‘soft sweep’. Your creationist source was either lying to you or has insufficient scientific knowledge to understand the paper. Either way you are relying on an unreliable source. Not a wise thing to do.In our sexual populations, adaptation is not associated with ‘classic’ sweeps whereby newly arising, unconditionally advantageous mutations become fixed. More parsimonious explanations include ‘incomplete’ sweep models, in which mutations have not had enough time to fix, and ‘soft’ sweep models, in which selection acts on pre-existing, common genetic variants. We conclude that, at least for life history characters such as development time, unconditionally advantageous alleles rarely arise, are associated with small net fitness gains or cannot fix because selection coefficients change over time.
rossum