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A New Report of Multiple Sex Chromosome System in the Order Gymnotiformes (Pisces)
An X 1 X 2 Y sex chromosome system is reported for the first time in Gymnotus sp. The chromosome number observed was 2nϭ40 (14 M-SMϩ26 ST-A) in females and 2nϭ39 (15 M-SMϩ24 ST-A) in males, with the same fundamental number in both sexes (FNϭ54). The multiple sex chromosome system might have been originated by a Robertsonian translocation of an ancestral acrocentric Y-chromosome with an acrocentric autosome, resulting in a metacentric neo-Y chromosome observed in males. Single NORs were detecteddoi:10.1508/cytologia.69.155 fatcat:di3qkjdawjgpxlyluvr7ixekci