G-band patterns of the Siberian snow sheep(Ovis nivicola) and their relationship to chromosomal evolution in sheep
作者:
C.F. Nadler,
T.D. Bunch,
期刊:
Cytogenetic and Genome Research
(Karger Available online 1977)
卷期:
Volume 19,
issue 2-3
页码: 108-117
ISSN:1424-8581
年代: 1977
DOI:10.1159/000130802
出版商: S. Karger AG
数据来源: Karger
摘要:
G-band patterns of the Siberian snow sheep, Ovis nivicola alleni, 2n = 52, were compared with the patterns reported in 2n = 54 wild Asiatic mouflon and 2n = 54 North American sheep and those in domestic sheep with 2n = 54, 53, and 52. The three largest pairs of biarmed autosomes displayed indistinguishable, presumably homologous, G-banding patterns in all types of sheep. The banding and morphology of the fourth pair of biarmed autosomes in O. nivicola differed from those of the three translocation variants described in domestic sheep. Wild sheep with 2n = 54 may have evolved monophyletically from an ancestral 2n = 58–56–54 population or polyphyletically by a series of independent, nonrandom fusions. In contrast, the fourth pair of biarmed autosomes in o. nivicola and in 2n = 52 domestic sheep variants may have resulted from random fusions of different chromoso
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