Table 3.

Nonrandom occurrence of mobile elements Penelope (Pen) and Ulysses (Uly) at inversion BP in the genome of D. virilis

Comparison type	Cobs*	Cexp†	Significance, P	Coincidence, P
Pen vs. BP	80	18.78	≪0.001	0.50
Uly vs. BP	57	14.94	≪0.001	0.33
Pen vs. Uly	82	19.18	≪0.001	0.50
Pen and Uly vs. BP	56	8.51	≪0.001	0.65

^*C_obs is the observed number of common subsections. 

^† C_exp is the expected number of common subsections, given a total of 1,359 subsections in the D. virilis chromosome map. The total number of inversion BPs compared in other species of the virilis group was 141, and the numbers of Penelope and Ulysses insertions sites observed in D. virilis were 181 and 144, respectively.