| 词汇 | founder-effect |
| 释义 | BETA founder effectcollocation in Englishmeanings of founderand effectThese words are often used together. Click on the links below to explore the meanings. founder noun[ C ] uk /ˈfaʊn.dər/ us /ˈfaʊn.dɚ/ someone who establishes ... See more at founder effect noun uk /ɪˈfekt/ us /əˈfekt/ the result of a ... See more at effect Examples of founder effectfounder effect Such studies are based on the premise that a foundereffect is present and detectable. The residents of enclaves may be expected to differ somewhat from the homeland population due to the foundereffect and subsequent genetic isolation. However, the foundereffect ignores the possibility that other non-reproductive life stages as well as males also balloon, contributing significantly to the aerial population. A selective sweep caused by the spread of a favourable mutation through a large population has similar effects on neutral diversity to a foundereffect. If so, the 'magnification' of a foundereffect could produce the observed frequencies. Dominant conditions with low reproductive fitness show little regional variation in frequency, but milder conditions may show variation as a result of foundereffect or genetic drift. Recurrent introduction, foundereffect, random genetic drift, and/or selection pressure caused by biotic and abiotic factors would also contribute to the final genetic make-up of the introduced population. One possible interpretation is that northern populations might not have experienced a strong bottleneck, but the observed low genetic variability could simply reflect a foundereffect. First, the so-called foundereffect occurs when founder populations bring only a subset of the genetic variation from their ancestral population. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In smaller communities, the foundereffect can result in a disease that is very rare worldwide being prevalent within the smaller community. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Together, this is described as the foundereffect. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Here, the foundereffect causes rapid speciation after an increase in inbreeding increases selection on homozygotes, leading to rapid genetic change. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A population bottleneck may also cause a foundereffect even though it is not strictly a new population. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Increased prevalence in some cases occurs due to a local foundereffect, a historical migration of carriers into an area of geographic isolation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Small populations of rare plants may be subject to the deleterious affects of inbreeding or the foundereffect. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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