map unit


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map unit

Etymology: L, mappa, napkin, unus, one
an arbitrary unit of measure used to express the distance between genes on a chromosome. It is calculated from the percentage of recombinations that occur between specific genes so that 1% of crossing over represents one unit on a genetic map, or approximately the number of new combinations that can be detected. The measurement is accurate only for small distances because double crossovers do not appear as new recombinations. Also called map distance. See also morgan.

map unit

An arbitrary unit for the distance between genes, usually derived from the percentage of recombination, but also defined by the time at which the gene is transferred during conjugation. One map unit corresponds to a recombination frequency of 1%.

map unit

or

linkage unit

a unit of ‘distance’ between genes along a chromosome. The number of map units is directly correlated with the amount of RECOMBINATION between loci; 1% recombination is equal to 1 map unit. See CROSS-OVER VALUE, GENETIC LINKAGE.

map distance, map unit

the amount of recombination between two genes expressed as a percentage. See also centimorgan.
References in periodicals archive ?
All soils within map units were assigned a hazard rating: not applicable, low, moderate or high.
As stated in the literature, many construction issues are encountered when cartographically depicting language, particularly with boundaries, map unit choice, and handling linguistic diversity.
There is a high variability in drainage classes within the previous map units that were identified as containing soils of a single drainage class (Fig.
A GIS approach was used to delineate Land Type Association (LTA) map units for the Hoosier National Forest (HNF) area.
Discrepancies between the geological map and image signatures within the coverage of existing data, alternatively, can provide rationale for reinterpreting map units and structures from geological field data.
Statistical and geostatistical variability of the soil properties were compared for the similar delineations of the soil map unit.
Misses: the participant incorrectly indicates that a map unit has not changed during a map transition, when in fact the mapped unit changed during a scene transition.
Map units are also described in terms of their land use, with each land system described with up to 6 individual components.
Depending on the soil survey type, the soil boundaries tend to be treated as preliminary soil map units that require field verification or as final products.
However, available reports and databases contain little if any information on soil map unit purity/composition or on soil property variability within map units.
This is why GlaxoSmithKline incubated the Cell Map unit to map the cellular interactions for therapeutically important proteins.
As attributes are highly variable and may also be sensitive parameters in models, users need to know the expected range of values (preferably as a statistical distribution) for attributes of interest within the map unit (Foussereau et al.