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What map unit (Centimorgan) is adopted in the construction of genetic maps? 

(1) A unit of distance between two expressed genes representing 10% cross over. 

(2) A unit of distance between two expressed genes representing 100% cross over. 

(3) A unit of distance between genes on chromosomes, representing 1% cross over. 

(4) A unit of distance between genes on chromosomes, representing 50% cross over.

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Correct option: (3) A unit of distance between genes on chromosomes, representing 1% cross over.

Explanation: 

Genetic Maps -  Genetic maps are widely used as a starting point in the sequence of whole genomes.  - wherein  

In a genetic map, the frequency of recombination between genes pairs on the same chromosomes is a measure of the distance between genes, and 'mapped' their positions on the chromosomes.           

A map unit refers to a unit of distance between genes on chromsomes that represent 1% cross over

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