Yosida T H
Cytogenet Cell Genet. 1977;18(3):149-59. doi: 10.1159/000130759.
Supernumerary chromosomes have been examined in 352 black rats, covering three geographic variants, by use of conventional and C-band staining techniques. Metacentric supernumerary chromosomes, one to three in number, were found in Malayan black rats (Rattus rattus diardii), with 2n=42, in Indian black rats (R. rattus rufescens), with 2n=38, and in Ceylonese black rats (R. rattus kandianus), with 2n=40. The supernumeraries had similar morphology and stained heavily along their entire length by C-band staining. These findings suggested that the supernumeraries had originally developed in the Asian-type black rats and then were sequentially transmitted to the Ceylonese and Oceanian-type black rats, probably in southwestern Asia. A subtelocentric supernumerary chromosome found in one Japanese black rat seemed to have developed independently from the above metacentric supernumeraries.
利用传统染色技术和C带染色技术，对涵盖三个地理变种的352只黑鼠的超数染色体进行了研究。在2n = 42的马来亚黑鼠（Rattus rattus diardii）、2n = 38的印度黑鼠（R. rattus rufescens）和2n = 40的锡兰黑鼠（R. rattus kandianus）中发现了数量为1至3条的中着丝粒超数染色体。这些超数染色体形态相似，经C带染色后沿其全长均有浓重染色。这些发现表明，这些超数染色体最初在亚洲型黑鼠中产生，然后可能在亚洲西南部依次传递给锡兰黑鼠和大洋洲型黑鼠。在一只日本黑鼠中发现的一条亚端着丝粒超数染色体似乎是独立于上述中着丝粒超数染色体而产生的。
