Bioscience 2010: Problems with evolution of mimicry “huge”
|April 7, 2014||Posted by News under Evolution, Darwinism, News|
… if the only possibility is Darwinism. From Bioscience, 2010:
The balance of Dazzled and Deceived focuses on the genetics and development of mimetic patterns, as revealed mostly through work with butterflies. The problems here are huge for evolutionary biologists. How does natural selection build a complex organism with all its integrated parts through fixation of random mutations? Butterfly mimicry has been a classic arena in which to tackle this problem precisely because the gambit is so obvious: To be a good mimic of another species requires many pattern elements of bars, lines, colors, and even wing shapes to change at once. Moreover, how can this process produce females that are perfect mimics and males that look nothing of the sort within a single species? These genetic requirements are seemingly at odds with our understanding of gradual evolutionary change and genes of small effect. Forbes takes us through the emergence of E. B. Ford’s school of ecological genetics and the basement-made butterfly crosses that eventually began to illuminate the problem of linked-gene complexes (“supergenes”), sex-linked inheritance, and modifier genes. The answers to the mimicry paradox, preliminary as they are still, inform modern evolutionary-developmental studies in all species and have launched the current effort to map a number of butterfly genomes. These genomic excursions promise to uncover the genetic architecture of mimetic patterns in a variety of species and in doing so uncover the fundamental basis of adaptation and speciation.
However, the answer to problems with Darwinism (natural selection acting on random mutations slowly builds up the disguise from say, 1% to 100%) is, of course, more Darwinism, now happily defined as progress.
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