Download PDF by M. Demerec (Ed.): Advances in Genetics, Vol. 5
By M. Demerec (Ed.)
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Extra resources for Advances in Genetics, Vol. 5
These situations will all be illustrated by the examples described in this article. 1. The Control of Balmced Polymorphism The nature of the opposing selective agencies which give rise to balanced polymorphism is sometimes evident. Any outbreeding mechanism, such as heterostyly or sex, clearly promotes diversity, and so does Batesian mimicry. I n other circumstances, we have little or nothing to show what are the advantages that are opposed to one another. If equilibrium is reached when one of the controlling genes is a t a low frequency (occupying a few per cent of the loci), we have effectively a dimorphism, segregating on the basis of heterozygote and one homozygote (assuming that a single pair of allelomorphs is involved).
1943, Isolation by distance. Genetics 28, 114-138. 1946, Isolation by distance under diverse systems of mating. Genetics 31, 39-56. 1948, On the roles of directed and random changes in gene frequency in the genetics of populations. Evolution 2, 279-294. 1949a, Adaptation and selection : in Genetics, paleontology and evolution. pp. 365-389. Princeton University Press, Princeton. 1949b, Population structure in evolution. Proc. Amer. phil. Soc. 93, 471-478. , 1949, Notes on home ranges and population density in two species of heteromyid rodents in southwestern Texas.
1939, Reactions of muskrat populations t o drought. Ecology 20, 168-186. 1944, Additional studies on tagged young muskrats. J. Wildlife Mamag. 8, 300-306. , and Errington, Carolyn Storm, 1037, Experimental tagging of young muskrats for purposes of study. J. Wildlife Manag. 1, 49-61. Evans, F. , 1942, Studies of a small mammal population in Bagley Wood, Berkshire. J. A n h Ecol. 11, 182-197. Evans, F. , 1943, A population study of the Beechey ground squirrel in central California. J. Mammal, 24, 231-260.
Advances in Genetics, Vol. 5 by M. Demerec (Ed.)