Essential Genetics 6th Edition by Daniel Hartl

Exercise 7

A coefficient of coincidence of 0.36 implies which one or more of the following statements are true:
(a) The frequency of double crossovers was 36 percent.
(b) The frequency of double crossovers was 36 percent of the number that would be expected if there were no interference.
(c) There were 0.36 times as many single crossovers as double crossovers.
(d) There were 0.36 times as many single crossovers in one region as there were in an adjacent region.
(e) There were 0.36 times as many parental as recombinant progeny.