Advances in Genetics, Vol. 5 by M. Demerec (Ed.)

By M. Demerec (Ed.)

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Occ. Pap, Univ. Minn. Mus. nat. Hist. 4, 1-49. Hacker, H. , a n d Pearson, H. , 1946, The growth, survival, wandering, a n d variation of the long-tailed field mouse, Apodemus sylvaticus. (Survival, b y H. P. Hacker). Biometrika 33, 333-361. Haldane, J. B. , 1948, The theory of a cline. J . Genet. 48, 277-284. Hamilton, W. , 1937a, Activity and home range of the field mouse, Miicrotus pennsylvanicus pennsylvanicus (Ord). Ecology 18, 255-263. 193713, Growth a n d life span of the field mouse. Amer.

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).

Southern (1940) recovered or observed 21 Oryctolagus culziculus after they had moved from the warren in which they were born. Six moved less than 70 yards, 9 less than 140, 3 less than 210, and 3 less than 280. 5 ; maximum, 16). 3. Rate of Dispersal The actual rate of dispersal is affected by so many variables that it is not presently possible to estimate reliably the rate of spread of a character through a population. Haldane (1948) has used the available data to attempt an estimate of the relationship between the intensity of selection, mean distance migrated per generation, and the slope of the cline in races of Peromyscus polionotus.

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