Answer: The "distance" between two linked gene pairs can be expressed as a percentage. The percentage of recombinant progeny produced in a cross is called THE RECOMBINATION (RECOMBINANT) FREQUENCY.
Explanation: The recombinant frequency is expressed as:
(Number of recombinant progeny ÷ total number of progeny) x 100
In percentage ranging from 1 - 49%, the genes are said to be linked. If it is 50% and above, the genes are not linked.