Table 1 Chromosomal formula, sex chromosome system occurrence, W-specific probe sites and 18S rDNA sites on the chromosomes of the Characidium species/populations analysed.
Species | River | Chromosomal Formula | Sex System | W probe sites | 18S rDNA sites/localization | Figure 3 relation |
|---|---|---|---|---|---|---|
C. zebra | Passa Cinco | ♂ ♀ 32 m+18 sm | Absent | Dispersed in autosomes | 23 pair/subterminal | (a) |
C. lauroi | Grande stream | ♂ 32 m+18 sm ♀ 31 m+18 sm+1st | ZZ/ZW | Autosomal and dispersed in the W chromosome | Z and W/terminal | (b) |
C. gomesi | Alambari | ♂ ♀ 32 m+18 sm | ZZ/ZW | Z in proximal region of the long arm, entire m W chromosome and some terminal minor sites over autosomes | Z and W/terminal and 19 pair/terminal in just one homologue in males | (c and d) |
C. gomesi | Grande | ♂ ♀ 32 m+18 sm | ZZ/ZW | Z in proximal region of the long arm, entire m W chromosome and some terminal minor sites over autosomes | 17 pair/terminal | (e and f) |
C. gomesi | Minhoca stream | ♂ ♀ 32 m+18 sm | ZZ/ZW | Z in proximal region of the long arm, entire m W chromosome and some terminal minor sites over autosomes | 17 pair/terminal | (g) |
C. gomesi | Verde | ♂ 32 m+18 sm ♀31 m+18 sm+1st | ZZ/ZW | Z in proximal region of the long arm, entire st W chromosome and some terminal minor sites over autosomes | 17 and 22 pairs/terminal and just one homologue of pairs 1 and 20/terminal | (h) |