title: Analysis of the genetic diversity and the phylogenetic evolution of Chinese sheep based on Cyt b gene sequences.
abstract: The complete sequences of Cyt b gene from 20 individuals belonging to eight Chinese indigenous sheep breeds and one foreign breed were studied. The results showed that the hapolotype diversity of Chinese sheep breeds was 97.1%. The mean nucleotide composition of all the sequences was 27.1% T, 28.5% C, 31.4% A, and 13.0% G. The nucleotide diversity was 0.602%. A total of 43 mutation sites were detected, including 40 transitions and 3 transversions. Fu's test of selective neutrality showed that the sheep populations had no population demographic expansion (0.10 >P > 0.05). The different clustering methods, namely neighbor-joining, minimum evolution, and unweighted pair group method with arithmetic means, all showed a similar result, which indicated that Chinese local sheep had three maternal resources.
authors.affiliation: College of Animal Science and Technology, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Yue-Hui
authors.initials: YH
authors.lastname: Ma
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
mesh_terms: D000818:Animals; D001483:Base Sequence; D002681:China; D003247:Conservation of Natural Resources; D045303:Cytochromes b / Q000235:genetics*; D019143:Evolution, Molecular; D014644:Genetic Variation; D009711:Nucleotides / Q000235:genetics; D010802:Phylogeny; D012756:Sheep / Q000235:genetics*
chemical_list: D009711:Nucleotides; D045303:Cytochromes b