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. 2013 Nov 1;14(1):750. doi: 10.1186/1471-2164-14-750

Table 4.

Number of transitions and transversions per genotype

'Georgia Belle’ 'Dr. Davis’ 'F8,1-42’
Transitions 374,886 227,722 339,879
Transversions 206,730 130,926 206,663
Ti/Tv ratio 3.6268 3.4786 3.2892

Ti/Tv is a ratio of rates, not of observed events. Since transitions are two times more frequent than transversions, the Ti/Tv ratio is twice the ratio of events = 2×(Ti/Tv).