| 词汇 | example_english_genetic-variance |
| 释义 | genetic variancecollocation in Englishmeanings of geneticand varianceThese words are often used together. Click on the links below to explore the meanings. Or, see other collocations with variance. genetic adjective uk /dʒəˈnet.ɪk/ us /dʒəˈnet̬.ɪk/ belonging or relating to genes (= parts of the DNA in cells) received by each animal or plant from ... See more at genetic variance noun uk /ˈveə.ri.əns/ us /ˈver.i.əns/ formal the fact that two or more things are different, or the amount or number by which they ... See more at variance Examples of genetic varianceThese 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. Therefore, the precise role of non-genetic heterogeneity in influencing the observed decline in geneticvariance is an important and open question. Several contributors try to underplay the role of epistasis, largely because it has little effect on geneticvariance! Among genetic parameter sets pertaining to a given ecological parameter set, there can be large variation in the (relative) geneticvariance maintained. With strong selection and many loci, linkage disequilibria are the main cause of changes in geneticvariance. With a continuum of alleles, gene flow inflates the geneticvariance in the same way as a source of mutations of small effect. With the advent of modern molecular technology, various components of epistatic geneticvariance can be separated and jointly estimated with saturated molecular markers. For increasing periods and without mutation, the (relative) geneticvariance decreases, but much more slowly than under strong selection. Directional selection can result in very large increases in geneticvariance as initially rare alleles increase in frequency. Therefore, directional selection in moderate to large-sized populations is likely to cause an increase in geneticvariance. In general, both stabilizing selection and migration will generate linkage disequilibrium and consequently changes in the geneticvariance. The heritability of a trait is its geneticvariance divided by total (genetic plus environmental) variance. We attempted to determine the additional geneticvariance, if any, captured by using marker haplotypes rather than single markers. Effects of genetic homozygosity would be misidentified as environmental variance in parent-offspring analyses and as nonadditive geneticvariance in twin studies. Furthermore, we can use the predictions derived from single-locus models to predict the partitioning of this geneticvariance. At age 24, the geneticvariance common to the disorders is wholly explained by such effects. This resulted from both a reduction in additive geneticvariance and increased environmental variance. As a consequence, the overall mean may be biased upwards, and the additive geneticvariance increased. Because migration leads to an increase in positive linkage disequilibrium and in the genetic variance, migration will in general indirectly increase the response to selection. Therefore, when the direction of selection changes, this allele can quickly rise in frequency, thus inducing much geneticvariance. 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. Want to learn more? Go to the definition of genetic Go to the definition of variance See other collocations with variance |
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