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Eine zentrische Spaltung und heterochromatische Polymorphismen in spanischen Rassen von Equus asinus
Author(s) -
Alaoui N.,
Jordana J.,
Ponsá M.
Publication year - 2004
Publication title -
journal of animal breeding and genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.689
H-Index - 51
eISSN - 1439-0388
pISSN - 0931-2668
DOI - 10.1046/j.1439-0388.2003.00437.x
Subject(s) - equus asinus , biology , heterochromatin , genetics , breed , equus , y chromosome , centromere , population , chromosome , haplotype , donkey , zoology , allele , gene , ecology , demography , sociology
Summary In this work a chromosomal study in Equus asinus is presented. Forty‐two specimens, belonging to five different Spanish breeds in risk of disappearing, have been analysed. Metaphases have been sequentially stained (uniform, G‐banded and C‐banded) and analysed. All specimens, except one, presented 2n = 62 chromosomes. Variation in chromosome number (2n = 63) is because of a fission in one chromosome of pair no. 3, resulting in two acrocentric chromosomes. Polymorphisms affecting the size of heterochromatic C+ bands and the presence of hetrochromatic 1p and 4p arms are also analysed. The results show no polymorphisms which can be attributed to a particular breed. From the chromosomal point of view, all Spanish asinine specimens correspond to a single population. Rearrangements detected suggest a fission tendency in the homologous E. asinus no. 3 chromosome in Equidae species.