Unusual chromosomal polymorphism of the common shrew, Sorex araneus L., in southern Belarus

By

Kryshchuk, Iryna A.
Orlov, Victor
Cherepanova, Elena
Borisov, I︠U︡. M. (I︠U︡riĭ Mikhaĭlovich)

Type

Article

Date of Publication

2021

Original Publication

Comparative cytogenetics : international journal of plant & animal cytogenetics, karyosystematics and molecular systematics

Volume

15

Series / Issue

Issue: 2

Pages

159--169

Subjects

Acrocentric morph , chromosomal race , dihybrid and trihybrid segregation , Hardy-Weinberg ratio

Contributed by

Pensoft Publishers

Language

English

Published by

St. Petersburg, Russia [Published] with technical support of Zoological Institute RAS [2007]-

Identifiers

DOI: https://doi.org/10.3897/CompCytogen.v15.i2.63084

 

Abstract

Analysis of the frequency of karyotypes and chromosomal rearrangements in the distributional ranges of four metacentric races of Sorex araneus Linnaeus, 1758 has revealed features that are not typical for polymorphic populations of this species. The frequency of the acrocentric karyotype and heterozygotes for fusion of acrocentric chromosomes turned out to be significantly higher than expected in case of random crossing. As an explanation for the unusual polymorphism, it has been suggested that metacentric races may hybridize with acrocentric populations that remained from the ancient chromosomal form.