Question

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

• A. A unit of distance between two expressed genes, representing 10% crossover
• B. A unit of distance between two expressed genes, representing 1% crossover
• C. A unit of distance between genes on chromosomes, representing 50% crossover
• D. A unit of distance between two expressed genes, representing 100% crossover

Answer 1

The correct option is B A unit of distance between two expressed genes, representing 1% crossover

Centimorgan (map unit) is a unit for measuring genetic linkage.

One map unit or centimorgan is the distance between two genes on the same chromosome, which show 1% crossover or recombination frequency.

It indicates that there is a chance of one percent (1%) for two genes to be separated by crossing over.