Abstract
SUMMARYTwo different types of the sex chromosomes were found in populations of the Tien Shan vole, Microtus kirgisorum, from northern and southern Kyrghyzstan, respectively. The X and Y chromosomes were acrocentric and the relative length of the X represented about 6.5% of the female haploid set in individuals from northern Kyrghyzstan. The biarmed X chromosome with a relative length almost twice as long as in northern populations and a considerably larger Y chromosome were observed in individuals originating from southern Kyrghyzstan. It was demonstrated that additions of large heterochromatic segments were responsible for the increase in the size of the sex chromosomes. The size and centromere position in the sex chromosomes were variable between individuals and populations in southern Kyrghyzstan. The evolution of the «giant» sex chromosomes in voles of the genus Microtus is discussed with respect to the case of M. kirgisorum. The first record of M. obscurus in Kyrghyzstan based on karyological identif...
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