position effect


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position effect

[pə′zish·ən i‚fekt]
(genetics)
Change in expressivity of a gene associated with changes in location on a chromosome, as from euchromatin to heterochromatin.
Inherent gene expression as influenced by neighboring genes.
References in periodicals archive ?
According to the serial position effect, readers recall information better when it is presented first (primacy) or last (recency) in a vector of words, rather than in the middle (Baddeley and Hitch, 1977; Glanzer and Cunitz, 1966; Roediger and Crowder, 1976).
LLTM can also be used to model construct irrelevant factors such as item format effects and item position effects (Kubinger, 2009).
This method has been previously shown to be effective for resolving the position effect for EMG control [16]; it increases the repeatability between the training and testing data sets [28].
For his part, Webb and Ray (1979) have showed that there is a serial position effect in four- ad blocks.
1999; Yin and Malepszy 2003) including "Position Effect" and copy number of transgene play a major role.
For example, Rebele, Stout, & Hassell (1991) reviewed several articles on course delivery and teaching methods and suggested that evidence regarding the impact of alternative teaching methods is, for the most part, The current study investigates whether or not the serial position effect can be observed in a real-world classroom setting where students have to learn, comprehend, and recall a large amount of related information over an extended time frame.
Locus control region function and heterochromatin-induced position effect variegation.
Keg and the Serial Position Effect: A Robust Classroom Demonstration.
(1993), we do not attach any theoretical importance to the locus of the serial position effect.
Furthermore, the investment in question will have a position effect on water quality in the North Sea; it forms part of international measures being taken forward under the 1985 Convention on the North Sea (the aim of which is to reduce the level of pollution in these waters)".
Because of the significant plot position effect and lack of interaction between plot position and treatment ([F.sub.1, 36] = 0.02, P = 0.90), we analyzed treatment effects on date of snowmelt with a randomized-blocks ANOVA on residuals from the plot position regression.

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