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Theory of RH (Radiation Hybrid) Mapping - In this method, following different steps are involved:

(i) A rodent human somatic cell hybrid, containing single copy of only one human chromosome of interest, is subjected to high dose of X-rays to break the human chromosome, into several fragments.

(ii) The broken fragments are recovered in rodent cells and about one hundred such rodent human hybrid clones are analysed for the presence or absence of specific human DNA markers.

(iii) When two markers are found on two fragments, we assume that break has occurred between loci of these two markers. Frequencies of clones showing breakage between different individual pairs of markers are recorded, which will be an index of distance between the two specific loci.

Utilizing this information, it is possible to arrange the loci of molecular markers in a linear order on the map, which is analogous to meiotic mapping.