| 单词 |
founder effect |
| 释义 |
founder effect
founder effectn. A random difference in allele frequencies of a population founded by a small group of organisms relative to the allele frequencies in the original population.founder effect
founder effect[′fau̇n·dər i‚fekt] (genetics) The overrepresentation of a specific allele at one or more loci in a new population that arises from a small number of individuals whose small gene pool may be unrepresentative of the parental population initially or as a result of the ensuing genetic drift. founder effect
found·er ef·fectan unusually high frequency of a gene in a particular population derived from a small set of unrepresentative ancestors.founder effectn. A random difference in allele frequencies of a population founded by a small group of organisms relative to the allele frequencies in the original population.founder effect the result of starting a new population with a low number of individuals (founders), so that their GENE POOL may not contain the same proportions of ALLELES for a particular LOCUS as in the original population. For example, instead of containing three alleles of the ABO BLOOD GROUP locus, Australian aborigines contain no B alleles and thus no Group B or Group AB individuals are produced, a situation probably caused by a ‘founder effect’. Such small founder populations are subject to RANDOM GENETIC DRIFT. |
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