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单词 expressivity
释义

expressivity


ex·pres·siv·i·ty

E0291900 (ĕk′sprĕ-sĭv′ĭ-tē)n. pl. ex·pres·siv·i·ties 1. The quality of being expressive.2. Genetics The degree to which an expressed gene produces its effects in an organism.

expressivity

(ˌɛksprɛˈsɪvɪtɪ) n1. (Art Terms) (esp of a work of art) the quality of being expressive2. (Genetics) genetics the strength of the effect of a gene on the phenotype

ex•pres•siv•i•ty

(ˌɛk sprɛˈsɪv ɪ ti)

n. 1. the quality or state of being expressive. 2. the degree to which a particular gene produces its effect in an organism. Compare penetrance. [1930–35; < German Expressivität]
Thesaurus

expressivity

nounVivid, effective, or persuasive communication in speech or artistic performance:articulacy, articulateness, eloquence, eloquentness, expression, expressiveness, facundity.
Translations
expressivitéэкспрессивность

Expressivity


Expressivity

 

the phenotypic manifestation of genes. Some genes in animals, plants, and microorganisms are characterized by comparatively constant expressivity; that is, they are manifested more or less equally in all the individuals of the corresponding genotype. For example, all wheat plants homozygous for the gene responsible for the absence of awns develop awnless spikes. Other genes—apparently the majority—are distinguished by changing expressivity. Rabbits and some other animals are known to have a Himalayan-pigmentation gene, which is responsible for black feet, ear, nose, and tail tips against a white or some other light background. However, such coloring appears only when young animals of the Himalayan breed are raised in environments having moderate temperatures. The for of individuals of the same Himalayan genotype becomes entirely white in high temperatures and black in low. This example shows that expressivity is influenced by environmental factors—in this case, the temperature.

Under identical environmental conditions, the expressivity of a gene may depend on the genotypic environment, that is, on the other genes with which the given gene combines to form the genotype. The possibility that stabilizing artificial selection can sometimes affect the extent to which hereditary traits are manifested in the phenotype suggests that modifier genes are involved in the variation of expressivity. Expressivity and penetrance, the principal interrelated indicators of phenotypic variability of gene manifestation, are widely used in phenogenetics, medical genetics, and breeding of animals, plants, and microorganisms.

REFERENCES

Lobashev, M. E. Genetika. Leningrad, 1967.
Timofeev-Resovskii, N. V., and V. I. Ivanov. “Nekotorye voprosy fenogenetiki.” In the collection Aktual’nye voprosy sovremennoi genetiki. Moscow, 1966.

V. I. IVANOV

expressivity


expressivity

 [eks″pres-iv´ĭ-te] the extent to which a heritable trait is manifested by an individual carrying the principal gene or genes that determine it.

ex·pres·siv·i·ty

(eks'pres-siv'i-tē), In clinical genetics, the degree of severity in which a gene is manifested.

expressivity

(ĕk′sprĕ-sĭv′ĭ-tē)n. pl. expressivi·ties 1. The quality of being expressive.2. Genetics The degree to which an expressed gene produces its effects in an organism.

expressivity

The degree of severity shown by an AUTOSOMAL dominant trait in any particular affected individual. The main feature of expressivity is its variability.

expressivity

the degree to which a particular gene exhibits itself in the PHENOTYPE of an organism, once it has undergone PENETRANCE. Thus, for example, a penetrant baldness gene in man can have a wide range of expressivity, from thinning hair to complete lack of hair.

expressivity

The extent to which an inherited trait or disease is manifested in the phenotype. It is a qualitative evaluation unlike penetrance. Syn. expression.

Patient discussion about expressivity

Q. where do the expression "going back on the wagon " come from? A. http://www.phrases.org.uk/meanings/on-the-wagon.html

Q. What role does emotion have in the life of someone with autism? I just find the whole disorder of autism hard to understand because I'm a really emotional person. I'm especially interested in how people with mild autism or Asperger's can function fine but then when it comes to feeling empathy they have such trouble. I guess my question is how such people experience emotion--are these people actually unable to care about others? My intention is not to sound ignorant, I'm genuinely curious.A. I have asperger's and most everything for me is logically analyzed and I have a difficulty knowing what emotion goes with certain situations and how the emotion manifests itself within me.
I care about others, I just cannot always put myself in their shoes and feel what they are feeling.

More discussions about expressivity

expressivity


  • noun

Synonyms for expressivity

noun vivid, effective, or persuasive communication in speech or artistic performance

Synonyms

  • articulacy
  • articulateness
  • eloquence
  • eloquentness
  • expression
  • expressiveness
  • facundity
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