Table 2 Comparison of genome features, map design features and derived estimates for three Daphnia genetic linkage maps
| Â | 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 | 1.13Â cM | 15.1Â cM | 7Â cM |
Linkage group size range | 109 – 203.6 cM | 31 – 288 cM (without minor groups) | 7 – 185 cM |
Physical length/cM | 160Â kb | 141Â kb | 133Â kb |
Percentage of markers with transmission ratio distortion | 43% (8% homozygote deficiency and 35% heterozygote deficiency) | 33% (mainly heterozygote deficiency) | 21% (mainly homozygote deficiency) |