Abstract
The objectives of this meeting were to update the standard karyotypes of cattle,goat,and sheep established at the first meeting in Reading.
Highlights
The purpose of the Second Conference for Standardization of Domestic Animal Karyotypes was to standardize karyotypes with different biu1ding techniques. which can be used for the description of chromosome abnor malities and for gene mapping. The objectives of this meeting were to update the standard karyotypes of callle. goat. and sheep established at the first meet ing in Reading and of the improved karyotype recommended by Long (1985) for sheep: to correlate the G-banded and R-band ed karyotypes and thereby establish standard karyotypes for R banded chromosomes; and to establish a system of nomenclature for both band types along with schematic representation
For these two species less information was available as a basis for establishing the standards than for cattle. for the G-bands. which limited the conclusions
Since some con fusion arose because in the proceedings ofthe Reading Conference the descriptions of G-bandt:d chromosomes and the correspond ing photographs were interchanged in the case of sheep chro mosomes 8 and 9, as well as 19 and 20, it was decided to use only the karyotype of Long ( 1985). as a basis for the one presented here
Summary
The objectives of this meeting were to update the standard karyotypes of callle. goat. and sheep established at the first meet ing in Reading and of the improved karyotype recommended by Long (1985) for sheep: to correlate the G-banded and R-band ed karyotypes and thereby establish standard karyotypes for R banded chromosomes; and to establish a system of nomenclature for both band types along with schematic representation. 18) in lhe proximal half of the chromosome with a large negative band (15) between bands 14 and 16; two prominent positive bands (21 and 31) separated by an additional small posi Live band (23) in the distal half of the chromo ome. 18) separated into two groups by a large negative band ( 15) in the proximal half of the chromosome: a prominent subterminal positive band (26). Four positive bands distributed (14, 21, 23, and 25); two prominent positive bands (31 and 33), a subt.erminal small positive band (35) in the distal part ofthe chromosome; a negative telomere. 19 R-bands; symmetrical pattern for regions No I and 2; two positive bands (13and 15) often joined in the proximal half of the chromosome: a prominent subterminal positive band (34); a positive telomere
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