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Gene mapping refers to the techniques used in molecular biology to determine the position of genes on the same chromosome. Gene mapping can be used to develop linkage analysis.

• In this case, the geneticists can use GENE MAPPING techniques in order to determine the position of specific mutations that cause Parkinson's disease.

• Two or more genes are linked when they are close on the same chromosome, thereby being inherited as a unit (i.e., as a linkage block).

• Linkage analyses enable us to determine the position of linked genes on the same chromosome.

• Gene mapping techniques include the use of molecular markers whose segregation evidence the position of target genes to be mapped.

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