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CentiMorgan (cM)

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Encyclopedia of Animal Cognition and Behavior
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Synonyms

Map unit

Definiton

CentiMorgan is defined as the distance between genes on the chromosome and is used to measure the recombination frequency.

Introduction

It is a map unit used to measure the genetic linkage, which is defined as the distance between two positions along the chromosome that results in 1% recombinant individual out of 100 progenies. The distance corresponding to this 1% recombination frequency is called centiMorgan (cM) (Lodish et al. 2004).

The term centiMorgan is given to genetic unit in honor of the great scientist Thomas Hunt Morgan.

$$ 100\;\mathrm{centiMorgan}=1\;\mathrm{Morgan} $$

If two loci are 1 cM apart, then a crossover occurs between them at an average of 1 in 100 meiosis. Therefore, cM is a measure of the genetic or linkage distance between two loci. One map unit is equal to 1 cM and 1 cM is equal to 1% recombination. Thus, two genes that recombine with a frequency of 3.5% bare said to be located 3.5 map units apart. This is not the same as physical...

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References

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Correspondence to Suman Yadav .

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Yadav, S. (2018). CentiMorgan (cM). In: Vonk, J., Shackelford, T. (eds) Encyclopedia of Animal Cognition and Behavior. Springer, Cham. https://doi.org/10.1007/978-3-319-47829-6_47-1

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  • DOI: https://doi.org/10.1007/978-3-319-47829-6_47-1

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  • Print ISBN: 978-3-319-47829-6

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