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Table 3 Patterns of fusion and fission revealed in the budgerigar, saker falcon, and the ostrich using the chicken genome as a reference

From: Chromosome-level assembly reveals extensive rearrangement in saker falcon and budgerigar, but not ostrich, genomes

Ancestral chromosome (numbered according to chicken) Budgerigar Saker falcon Ostrich Chicken Chicken-ostrich differences
Inter- Intra- Inter- Intra- Inter- Inter- Intra-
1 Fission 1 Fission 4 0 0 0
2 2 Fission and fusion to GGA21 and 28 0 0 0 0
3 Fusion to GGA17 3 Fission 4 0 0 3
4a 0 2 0 Fusion 1
4b Fusion to GGA9 0 Fusion to GGA15 4 0 2
5 Fission and fusion to GGA6 1 Fission and fusion to GGA10 and 20 2 0 0 1
6 Fusion to GGA5 0 Fusion to GGA17 3 0 0 0
7 Fission and fusion to GGA6 and 5 1 Fusion to GGA13 2 0 0 3
8 Fusion to GGA9 0 0 0 0 1
9 Fusion to GGA8 1 0 0 0 0
10 Fusion to GGA12 0 Fusion to GGA5 0 0 0 0
11 Fusion to GGA4q 0 0 0 0 0
12 Fusion to GGA10 1 Fusion to GGA14 0 0 0 0
13 Fusion to GGA20 0 Fusion to GGA7 0 0 0 0
14 Fusion to GGA5 1 Fusion to GGA12 and 28 1 0 0 1
15 2 Fusion to GGA4q and 19 2 0 0 0
16 No data No data No data No data No data No data No data
17 Fusion to GGA3 0 Fusion to GGA6 1 0 0 0
18 1 Fusion to GGA19 2 0 0 1
19 0 Fusion to GGA15 and 18 0 0 0 0
20 Fusion to GGA13 0 Fusion to GGA5 0 0 0 0
21 0 Fusion to GGA2 and 23 0 0 0 0
22 0 2 0 0 1
23 2 Fusion to GGA21 2 0 0 0
24 0 1 0 0 0
25 No data No data No data No data No data No data No data
26 0 2 0 0 0
27 0 1 0 0 0
28 0 Fusion to GGA2 and 14 1 0 0 0
Z 0 0 0 0 0
  1. The left-hand column represents the ancestral avian chromosome, with the subsequent columns indicating the number of inter- and intrachromosomal changes detected that have led to each extant species. For the intrachromosomal differences between ostrich and chicken, in the absence of an outgroup, the direction of change cannot be determined and thus only differences between the two species is noted