tailieunhanh - Báo cáo khoa hoc:" Inheritance of color in D. Angora goats"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học thế giới đề tài: Inheritance of color in D. Angora goats | Genet. Sei. Evol. 30 1998 385-395 Inra Elsevier Paris 385 Original article Inheritance of color in Angora goats D. Phillip Sponenberga Snejana Alexievab Stefan Adalsteinssonc a Department of Biosciences and Pathobiology Virginia-Maryland Regional College of Veterinary Medicine Virginia Tech Blacksburg VA 24061 USA b 207 Wharton St Apt Blacksburg VA 24060 USA c Sudurgata 24 IS-101 Reykjavik Iceland Received 15 January 1998 accepted 14 May 1998 Abstract Inheritance of color in Angora goats deviates from mechanisms previously reported in other breeds and types of goats. Segregation data are most consistent with the presence of a dominant white that is epistatic to the Agouti and Extension loci. This newly documented locus White Angora IVta has two alleles dominant white WtaD and wild wta . Goats lacking dominant white are various colors as determined by other loci. The segregation data support the existence of a dominant black that is epistatic to the Agouti locus an action consistent with dominant black ED at the Extension locus. Alleles at the Agouti locus segregate as well and include white or tan Awt badgerface Ab black and tan A and no pattern Aa . Two otherpatterns likf ly at the Agouti locus were also segregating and are called peacock A1 and san Clemente Asc after breeds in which each is widespread. Phenotype on goats bearing white or tan varied from white to reddish with a few goats being dark tan-brown with darker tan shoulder and back stripes. One reddish tan kid segregated from two black and tan parents suggesting that a recessive pheomelanic genotype might also be present in the breed. This is likely a recessive allele at the Extension locus. The usual white Angora goat appears to have the dominant white allele in conjunction with white or tan at Agouti. The allele dominant black at Extension is also relatively frequent. Inra Elsevier Paris coat color goat Angora goat genetics Resume Hérédité de la coloration chez les chèvres Angora. L hérédité de la .