By C. D. Darlington (auth.), Robert Creed (eds.)
One of the privileges of appointment to a Chair at one other collage is that it provides one the correct to speak to many uncommon humans approximately their paintings and ideas. E. B. Ford used to be recognized to me earlier than I got here to Oxford because the writer of a booklet on butterflies and as a bit of an eccentric, yet i used to be relatively unprepared for the welcome he gave me into the dept of Zoology and for the big curiosity of the topic which he steadily published to me. My touch with the Genetics Laboratory was once made more straightforward via one of many first issues I needed to do. inside of a number of weeks of my arrival, it got here to gentle new construction for one more division was once to be erected on a bit of land, identified to us as 'Henry's weed backyard' yet typically considered as being derelict. Even my, at the moment, undemanding, wisdom of ecological genetics made it effortless to achieve that the inhabitants of caterpillars that have been lower than non-stop statement there for 11 years positioned it in a slightly distinct type of wasteland; even though i didn't reach saving it, i used to be in a position to convince the college to replacement one other experimental plot and this can have helped the geneticists to understand that the recent professor was once not just attracted to electric apparatus.
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1968) The Evolution o/Man and Society. Allen & Unwin, London. D. K. (1945) Adaptive isochromosomes in Nicandra. Ann. Bot. 9, 267-281. D. W. (1959) Parallel polymorphism in the heterochromatin of Trillium species. Heredity 13,89-121. D. P. (1956) Chromosome atlas 0/ /lowering plants. Allen & Unwin, London. DOBZHANSKY Th. (1951) Genetics and the Origin 0/ Species. (3rd edition). , New York. J. (1956) Heterostyly and homostyly in Primula obconica. Heredity 10,219-236. A. (1930, 1958) The genetical theory o/natural selection.
How well adapted are these cliff populations to their environments? To determine this it is necessary to subject the plants to the sort of environmental conditions that they experience on their cliffs, either by transplant experiments or in other ways that simulate cliff environments. When Agrostis stolonifera popUlations were subject to wind exposure the cliff population showed an approximately 25 per cent selective advantage over inland popUlations (Aston & Bradshaw 1966). Similar differences were found for A.
Two transects were made, one in a predominantly upwind and the other in a predominantly downwind direction. In the upwind direction the adults show the sort of very sharp transition in CHAPTER 2 tolerance at the boundary that we have already seen for Anthoxanthum, but in the down wind direction the transition is by no means so sharp and populations some distance away from the mine in completely normal pasture have a quite considerable level of tolerance (fig. 12). The difference between the two transects is surprising.