![]() ![]() ![]() The Y chromosomes in both species have large heterochromatic blocks with extensive accumulations of GATA and AC microsatellite motifs. burtonis, but the largest macrochromosomal pair in the karyotype. Both species possess male heterogamety with an X 1X 1X 2X 2/X 1X 2Y sex chromosome system however, the Y and one of the X chromosomes are not small chromosomes as previously reported in L. We conducted cytogenetic analyses including comparative genomic hybridization and fluorescence in situ hybridization (FISH) with selected cytogenetic markers in this species and the previously cytogenetically unstudied Papua snake lizard (Lialis jicari) to better understand the nature of these sex chromosomes and their differentiation. In the pioneering study published more than 45 years ago, multiple sex chromosomes of the type X 1X 1X 2X 2/X 1X 2Y were described in Burton's legless lizard (Lialis burtonis) based on conventional cytogenetic techniques. Geckos in general show extensive variability in sex determining systems, but only male heterogamety has been demonstrated in the members of their legless family Pygopodidae. ![]()
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