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

1. A. (1) A unit of distance between genes on chromosomes, representing 50% cross over.
2. B. (2) A unit of distance between two expressed genes representing 10% cross over.
3. C. (3) A unit of distance between two expressed genes representing 100% cross over.
4. D. (4) A unit of distance between genes on chromosomes, representing 1% cross over.

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