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Abstract <p>Using material from laboratory colonies, it was established that the variability of deviations from the typical form (tf) of the anterior lobe of M<sup>1</sup> in lemmings of the genus <i>Lemmus</i> forms a bilateral morphological module, designated as atypical form (AF). Three morphotypes of AF have been identified, differing in degree of complexity. The main component of modular variability is an increase in the frequency of individuals with the AF phenotype and the degree of expression of this phenotype with age. Segregation in the offspring into AF and tf individuals in various crossing options does not contradict the hypothesis of monogenic inheritance of these variations. Individuals with the tf phenotype are recessive homozygotes. Sometimes, there may be undetected heterozygotes among them. Which phenotype (tf or AF) a heterozygote exhibits may depend on the litter number and (or) on the influence of modifier genes. Dominant homozygotes are considered nonviable.</p>

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Variation and Inheritance of an Atypical Form of the Anterior Lobe of M1 of Lemmus trimucronatus chrysogaster (Rodentia, Arvicolinae)

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • M. I. Cheprakov

摘要

Abstract

Using material from laboratory colonies, it was established that the variability of deviations from the typical form (tf) of the anterior lobe of M1 in lemmings of the genus Lemmus forms a bilateral morphological module, designated as atypical form (AF). Three morphotypes of AF have been identified, differing in degree of complexity. The main component of modular variability is an increase in the frequency of individuals with the AF phenotype and the degree of expression of this phenotype with age. Segregation in the offspring into AF and tf individuals in various crossing options does not contradict the hypothesis of monogenic inheritance of these variations. Individuals with the tf phenotype are recessive homozygotes. Sometimes, there may be undetected heterozygotes among them. Which phenotype (tf or AF) a heterozygote exhibits may depend on the litter number and (or) on the influence of modifier genes. Dominant homozygotes are considered nonviable.