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step of identification of the gene. The genetic distance to physical distance ratio varies greatly at different genomic regions which reflects different recombination rates, and such rate is often indicative of euchromatic (usually gene-rich) vs heterochromatic (usually gene poor) regions of the genome. Contents, genetic mapping vs physical mapping edit, there are two distinctive types of "Maps" used in the field of genome mapping: genetic maps and physical maps. Genetic mapping in plants are often constructed utilizing segregating populations from crosses between inbred lines, but this strategy is not possible for many of those plants that have high heterozygosity and long life cycles, such as forest trees (Grattapaglia and Sederoff, 1994 fruit trees (Kenis.
Retrieved January 27, 2012. A Genetic Linkage Map of Phalaenopsis-based on aflp Markers and the "Two-way Pseudo-testcross" Mapping Strategy. New York, NY, USA: Henry Holt and Company, 1922. . While both maps are a collection of genetic markers and gene loci, genetic maps' distances are based on the genetic linkage information, while physical maps use actual physical distances usually measured in number of base pairs. Calgary, Alberta, Canada: University of Calgary.