Titlebook: Ecological Genetics; E. B. Ford Book 1975Latest edition E. B. Ford 1975 chromosome.climate.evolution.genetics.mutant

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Balanced Polymorphism in ,r group. Yet by now the available information upon this subject has become too extensive to summarize effectively in the space available in this book, supposing indeed it were desirable to do so. However, this is a work designed to develop principles, with examples sufficient to illustrate them but

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Polymorphism and the Effects of the Switch-Gene,oncerned, dominance may sometimes be attained by distinct adjustments in different isolated populations. That situation must often arise in polymorphism and the Lesser Yellow-underwing moth, ., seemed to provide an opportunity for examining it. This species, which belongs to the family Agrotidae, is

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Polymorphism and the Super-gene in Snails,ene. Some indication of that occurrence was obtained from those species in which various phases are apparently determined by a series of alleles (p. 120), while clear evidence for it can be derived from the examples to be discussed in this and the four succeeding chapters.

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Onerous

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chisel

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Transient Polymorphism and Melanism,hat process is taking place, but not before or after, it will generate a transient polymorphism. Such an occurrence is not possible unless a genetic reconstruction has occurred in the population or it has expanded into a new and different habitat, or else the environment has changed. For the recurre

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Isolation and Adaptation, isolated, but only to the average conditions of relatively extensive and diversified ones. Those situations were illustrated by the butterfly . on large and small islands in the Isles of Scilly (pp. 61–77). Furthermore, clines may be formed if a large region is subdivided ecologically in such a way

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Conclusion, it restricted to the conventional 2 per cent of the whole. Yet it seems appropriate, here at the end of this work, to draw attention to a few of the most important conclusions to which the techniques of ecological genetics have led. This may in part be done by correcting a misconception; one not wi