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Table 1 Observable numbers of recombination events between two biallelic tetraploid markers

From: PERGOLA: fast and deterministic linkage mapping of polyploids

  AAAA AAAB AABB ABBB BBBB
AAAA 0 1 2 3 4
AAAB 1 0 1 2 3
AABB 2 1 0 1 2
ABBB 3 2 1 0 1
BBBB 4 3 2 1 0
  1. A and B are the major and minor alleles, respectively. Higher numbers of recombination are possible due to double crossovers (i.e. AAAA /AAAA could be 2 or 4), but ignored by the heuristic