PearlWatson
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London underground mosquito says hi again.
Professor of Genetics Says 'No!' to Evolution
being also an academic teacher in population genetics, I found it necessary to play down the evolutionary explanations given in textbooks, for the simple reason that I find no evidence to support them. In fact, it was my teaching of population genetics, coupled with the discovery that my children are being taught evolution in secondary school on the claim that population genetics provides evidence for it, that made me enter the debate publicly.
I had been taught that palaeontology gives the bulk of the evidence for evolution. To my surprise, I found that evidence is lacking not only in genetics but also in palaeontology, as well as in sedimentology, in dating techniques, and in fact in all sciences. However, here I shall restrict myself to a review of the arguments for evolution drawn from my field, genetics.
Perhaps the most evident misinformation in textbooks is the suggestion that microevolution is a small-scale example of macroevolution.
MICROEVOLUTION
The example used to support this is usually the story about the grey or black moths (Biston betularia) living on the bark of trees, the population adapting in colour to the colour of the bark — darker in industrial, polluted environments, and lighter in cleaner ones.
The misinformation lies in concealing the fact that select, adapted populations are genetically poorer (fewer alleles1) than the unselected natural populations from which they arose. We find the same in forest trees. In polluted environments, the surviving trees have fewer alleles than in non-polluted ones. Microevolution, formation of races, is a fact. Populations adapt to specific environments with the more successful alleles increasing in numbers and others declining in frequencies or disappearing altogether. Change can also occur due to accidental loss of alleles (genetic drift) in small isolated populations. Both amount to decline in genetic information. Macroevolution requires its increase.
POSITIVE MUTATIONS?
A useful mutation (e.g. an orange without seeds) is not the equivalent of a positive mutation. I felt uneasy lecturing about positive mutations when I could not give an example. There are very many examples of negative and neutral mutations, but none I know of which I could present as a documented example of a positive one.
Genetic literature on the subject often confuses mutations with alleles, or even mutations with recombinations. The finding of an allele that is useful for some purpose is not the equivalent of demonstrating a positive mutation — similarly when the find concerns a useful recombinant of alleles existing in the gene pool.
Variants of alleles in a gene pool are a fact of life. How they came to be is another matter. Some, usually neutral or excessively deleterious, arise from mutations. Some are introgressants from other species. Still others are within the population since its origin — however that came about.
Professor Maciej Giertych, M.A.(Oxford), Ph.D.(Toronto), D.Sc.(Poznan), is head of the Genetics Department of the Polish Academy of Sciences at the Institute of Dendrology in Kornik, Poland.