Genetics and selection at the Ng locus in blue grouse (Dendragapus obscurus)
| Autor: | J A Redfield |
|---|---|
| Rok vydání: | 1974 |
| Předmět: | |
| Zdroj: | Heredity. 33:69-78 |
| ISSN: | 1365-2540 0018-067X |
| DOI: | 10.1038/hdy.1974.65 |
| Popis: | The Ng locus is an electrophoretically detectable polymorphism in blue grouse with three alleles widespread in birds on Vancouver Island and the adjacent mainland. Little, if any, migration occurs between populations, suggesting that the polymorphism is maintained by selection. No differences were found in reproductive output of different genotypes but survival was selective. In one year juvenile birds with the most common genotype survived better than juveniles with other genotypes. Heterozygous birds 1 year old and older survived best in 2 years with harsh winter weather. In one year with mild winter weather no differences in survival were found. Although the actual mechanism of selective death is not known, the evidence suggests that heterozygous advantage is one of the means of maintaining genetic polymorphisms. However, several other components of fitness at this locus have been found and these must also be considered in the maintenance of this polymorphism. |
| Databáze: | OpenAIRE |
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