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Henry Bernard Davis Kettlewell (24 February 1907 – 11 May 1979) [1] was a British geneticist, lepidopterist and medical doctor, who performed research on the influence of industrial melanism on peppered moth (Biston betularia) coloration, showing why moths are darker in polluted areas.
He has a particular research interest in the peppered moth, [1] [2] and published a book, Observing Evolution: Peppered Moths and the Discovery of Parallel Melanism [3] in 2021. Grant has a B.S. in Biology from Bloomsburg University of Pennsylvania in 1964, an M.S. in Genetics from North Carolina State University , Raleigh in 1966 and a Ph.D ...
Wells wrote an essay on the subject, a shortened version of which appeared in The Scientist of 24 May 1999, claiming that "In 25 years of fieldwork, C.A. Clarke and his colleagues found only one peppered moth on a tree trunk", and concluding that "The fact that peppered moths do not normally rest on tree trunks invalidates Kettlewell's ...
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 peppered moth (Biston betularia) is a temperate species of night-flying moth. [1] It is mostly found in the northern hemisphere in places like Asia, Europe and North America. Peppered moth evolution is an example of population genetics and natural selection. [2] The caterpillars of the peppered moth not only mimic the form but also the ...
He was widely noted for his work on moths and ladybirds and as an advocate of the science of evolution. He was also an enthusiastic educator [1] [2] and the author of several books on insects, [3] [4] evolution [5] [6] and sexual reproduction. [7] He is best remembered as an ardent supporter and champion of experiments on peppered moth ...
Melanism: Evolution in Action (ISBN 0-19-854982-2) is a book by Dr. Mike Majerus, published in 1998. It is an update of Bernard Kettlewell 's book The Evolution of Melanism . The book contains a very useful summary of Majerus' work on melanism in ladybirds and a review of the peppered moth story, including observations on moth behavior which ...
Industrial melanism is known from over 70 species of moth that Kettlewell found in England, and many others from Europe and North America. [17] Among these, Apamea crenata (clouded border brindle moth) and Acronicta rumicis (knot grass moth) are always polymorphic, though the melanic forms are more common in cities and (like those of the peppered moth) are declining in frequency as those ...