Genetic distance
A way of measuring the amount of evolutionary divergence in two separated populations of a species by counting the number of allelic substitutions per locus that have cropped up in each population.
Related Terms:
Population ...
Measure for genetic distance of two individuals or varieties. Values range between 0 (= no common ancestor) to 1 (= same individual or variety).
Related Terms:
Genetic distance ...
Correspondence analysis: A complementary analysis to genetic distances and dendrograms. It displays a global view of the relationships among populations (Greenacre MJ, 1984; Greenacre & Blasius, 1994; Blasius & Greenacre, 1998).
Microsatellites developed for particular species can often be applied to closely related species, but the percentage of loci that successfully amplify may decrease with increasing genetic distance.
Recent electrophoretic work has shown that the genetic distances among flies from different sympatric hosts species are greater than the distances among flies on the same host in different geographic areas (Waring et al. 1990).
Two markers are said to be 1 cM apart if they are separated by recombination 1% of the time. A genetic distance of 1 cM is roughly equal to a physical distance of 1 million bp (1 Mb).
The progeny of the cross are selfed over several generations in so that they are homozygous at all loci, but each RI has a distinct recombinant geneotype. In these lines, genetic distance is calculated based upon the recombination frequencies ...
 See also: DNA, Gene, Sequence, Marker, Organ
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