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Author Topic:   Debunking the Evolutionary God of 'Selection'
Diomedes
Member
Posts: 995
From: Central Florida, USA
Joined: 09-13-2013


Message 248 of 323 (810738)
06-01-2017 10:39 AM
Reply to: Message 247 by Davidjay
06-01-2017 9:30 AM


Re: Peppered moths are color change and not evolutionary change
Peppered Moth Overview
Explanation:
quote:
The evolution of the peppered moth is an evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial Revolution. The frequency of dark-coloured moths increased at that time, an example of industrial melanism. Later, when pollution was reduced, the light-coloured form again predominated. Industrial melanism in the peppered moth was an early experimental test of Charles Darwin's natural selection in action, and remains as a classic example in the teaching of evolution. Sewall Wright described it as "the clearest case in which a conspicuous evolutionary process has actually been observed."
Genetics:
quote:
In 1924, J.B.S. Haldane calculated, using a simple general selection model, the selective advantage necessary for the recorded natural evolution of peppered moths, based on the assumption that in 1848 the frequency of dark-coloured moths was 2%, and by 1895 it was 95%. The dark-coloured, or melanic, form would have had to be 50% more fit than the typical, light-coloured form. Even taking into consideration possible errors in the model, this reasonably excluded the stochastic process of genetic drift, because the changes were too fast.Haldane's statistical analysis of selection for the melanic variant in peppered moths became a well known part of his effort to demonstrate that mathematical models that combined natural selection with Mendelian genetics could explain evolution an effort that played a key role in the foundation of the discipline of population genetics, and the beginnings of the modern synthesis of evolutionary theory with genetics.
In peppered moths, the allele for dark-bodied moths is dominant, while the allele for light-bodied moths is recessive, meaning that the typica moths have a phenotype (visible or detectable characteristic) that is only seen in a homozygous genotype (an organism that has two copies of the same allele), and never in a heterozygous one. This helps explain how dramatically quickly the population changed when being selected for dark colouration.
The peppered moth Biston betularia is also a model of parallel evolution in the incidence of melanism in the British form (f. carbonaria) and the American form (f. swettaria) as they are indistinguishable in appearance. Genetic analysis indicates that both phenotypes are inherited as autosomal dominants. Cross hybridizations indicate the phenotypes are produced by isoalleles at a single locus.
Creationist Facepalm : EPIC!

This message is a reply to:
 Message 247 by Davidjay, posted 06-01-2017 9:30 AM Davidjay has replied

Replies to this message:
 Message 249 by Davidjay, posted 06-01-2017 11:03 AM Diomedes has not replied

  
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