2001 年 66 巻 4 号 p. 385-393
The morphology of the pachytene chromosomes of Hyoscyamus muticus (2n=28) was analysed. All 14 pachytene chromosomes were clearly identified on the basis of length, arm ratio, distribution of heterochromatin and presence of characteristic chromomeres. The pachytene chromosomes were differentiated into proximal heterochromatic regions surrounding the centromere and distal euchromatic regions. Chromosomes were numbered from 1 to 14 following a descending order of length. The physical lengths of the 14 chromosome pairs ranged from 28.23 to 101.47 μm with a total length of 877.69 μm. Based on the centromere position, the complement consisted of 4 chromosomes with median centromeres, 7 with subterminal centromeres and 3 with terminal centromeres.