墨西哥黑鼠（褐家鼠）的亚洲核型（2n = 42）
Asian karyotype (2n = 42) in the black rat (Rattus rattus) in Mexico.
作者信息
Alonso R A, Villagomez D A, Sanchez A, Cantu J M
出版信息
Ann Genet. 1982;25(3):133-5.
PMID:6982658
Abstract
A cytogenetic survey in 10 black rats (Rattus rattus), captured in Guadalajara, Jalisco, Mexico, revealed a 42 chromosomal complement (Asian type) in all of them. Polymorphism due to pericentric inversions of chromosomes 9, 11 and 13, as well as a homomorphic subtelocentric pair 1, permitted further karyotypic distinction. An Asian origin of this rat with a subsequent isolated evolution in Mexico is concluded.
摘要
在墨西哥哈利斯科州瓜达拉哈拉捕获的10只黑鼠（褐家鼠）的细胞遗传学调查显示，它们全部具有42条染色体的核型（亚洲类型）。由于9号、11号和13号染色体的臂间倒位以及同态亚端着丝粒对1导致的多态性，使得核型有了进一步的区分。得出结论，这种老鼠起源于亚洲，随后在墨西哥独立进化。
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