Fig. 2.

Male meiosis in putative hybrids of Triatoma sordida subcomplex (2n = 20A + XY). a: Metaphase I with C-banding. Three types of bivalents are observed: heterochromatic (C-region in one chromosomal end), euchromatic (without C-region) and heterozygote bivalents with one homologous heterochromatic and the other euchromatic (arrowheads). b-c: Metaphase I and metaphase II, respectively. Fluorescent in situ hybridization with 45S ribosomal DNA probe. Ribosomal signals (arrows) can be located in one heterozygote autosomal pair (b) or in an autosomal pair and X chromosome simultaneously (c). Bar = 10 μm