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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.

Correct answer: A unit of distance between genes on chromosomes, representing 1% cross over.

Solution

A centimorgan is the standard genetic map unit and corresponds to a 1% recombination frequency between two loci on a chromosome. It measures relative distance on a genetic map, not physical base-pair length.

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