Fine scale structural variants distinguish the genomes of Drosophila melanogaster and D. pseudoobscura

Table 1 Distribution of fine-scale structural features across chromosome arms

	Number of orthologous pairs
Chromosome arm*	Tested^†	Harboring microinversions^‡	Harboring intragenic indels^‡
X	880	24 (0.111)	12 (0.889)
2L	997	34 (0.003)	19 (0.294)
2R	1,120	7 (<0.001)	15 (0.805)
3L	1,177	21 (0.752)	22 (0.279)
3R	1,560	26 (0.464)	18 (0.297)
All 5 major arms	5,734	112	86

*The chromosome arms are given the D. melanogaster designations, X, 2L, 2R, 3L, and 3R. These arms are known to be orthologous to D. pseudoobscura arms, XL, 4, 3, XR, and 2, respectively [58]. ^†The number of conserved orthologs residing on each arm. ^‡Values in parentheses are P values from a two-sided Binomial test of whether the number of event-harboring orthologs per arm differs from expectation. For each test, the number of trials equals the number of conserved orthologs per arm, the number of successes equals the number of event-harboring genes per arm, and the probability of success is equal to the total number of event-harboring genes detected divided by the total number of conserved orthologs tested (5,738).

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