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Need genetic distance measurement units #3

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
CentiMorgan (cM)

    A unit used to express distances on a genetic map. In genetic mapping, distances between markers are determined by measuring the rate of meoitic recombination between them, which increases proportionately with the distance separating them. A cM is defined as the length of an interval in which there is a 1% probability of recombination. On the average, 1 cM is roughly equivalent to 1 megabase (Mb) of DNA, although this can vary widely due to hot and cold spots of recombination. 

CentiRay (cR)

    A unit of genetic map distance defined corresponding to an interval in which there is a 1% probability of X-irradiation induced breakage. To be completely specified, the unit must be qualified by the radiation in dosage in rads (e.g. cR8000), because this determines the actual breakage probability. 

Definitions taken from http://www.ncbi.nlm.nih.gov/SCIENCE96/Glossary.html

Original issue reported on code.google.com by nicole.l...@gmail.com on 3 Dec 2012 at 11:58

GoogleCodeExporter commented 8 years ago 
Terms and proposed definitions added.

Many thanks Nicole and I apologise for the delay,

George

Original comment by g.gkou...@gmail.com on 6 Dec 2013 at 12:28