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Table 2 Comparison of genome features, map design features and derived estimates for three Daphnia genetic linkage maps

From: An SNP-based second-generation genetic map of Daphnia magna and its application to QTL analysis of phenotypic traits

  D. magna SNP-based map D. magna VNTR map [27] D. pulex VNTR map [26]
Number of chromosomes (from cytological work) 10 10 12
Genome size estimate 238 mb 238 mb 190 mb
Number of markers used for map 1324 109 185
Number of F2 clones used for map 353 214 129
Number of linkage groups recovered 10 10 (+ several minor groups) 12
Map length [cM] 1483.6 1692.5 1206
Average length of marker interval 1.13 cM 15.1 cM 7 cM
Linkage group size range 109 – 203.6 cM 31 – 288 cM (without minor groups) 7 – 185 cM
Physical length/cM 160 kb 141 kb 133 kb
Percentage of markers with transmission ratio distortion 43% (8% homozygote deficiency and 35% heterozygote deficiency) 33% (mainly heterozygote deficiency) 21% (mainly homozygote deficiency)
  1. The two D. magna maps are based on the same genetic cross.