Fertile XX- and XY-type females in the wood lemming Myopus schisticolor

Fredga, Karl; Gropp, A.; Winking, Heinz; Frank, Fritz

doi:10.1038/261225a0

Cited by 188 publications

(94 citation statements)

References 6 publications

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“…It has therefore been of interest to discover that some species deviate from this pattern. In particular, some rodent populations contain a large proportion of XY females (Rausch and Rausch, 1972;Fredga et al, 1976;Gileva and Chebotar, 1979).…”

Section: Introductionmentioning

confidence: 99%

The evolution of XY females in mammals

Bull

Bulmer

1981

Heredity

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SUMMARYSome lemmings have a large proportion of XY females in the population, as well as XX females and XY males. In this paper we first review the biological literature on XY females in mammals, with particular emphasis on the genetics and cytogenetics of this trait. We then consider population genetics models of the behaviour of this trait, and we show that there are serious discrepancies between predictions and observations regarding the sex ratio and the frequency of XY females; in several lemming populations the reported sex ratio is lower and XY females are more common than expected. Finally we consider evolutionary models to understand why XY females persist in these populations and how selection might act on other parts of the reproductive biology to modify the system.

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Section: Introductionmentioning

confidence: 99%

The evolution of XY females in mammals

Bull

Bulmer

1981

Heredity

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“…In X*Y females of the Wood Lemming only X*bearing gametes are formed (Fredga et al, 1976(Fredga et al, , 1977 and in the males of the Varying Lemming the Y segregates have a ratio of 0.54-0.59 (Gileva, 1987). In both cases meiotic drive is observed to bring about a reduction in the proportion of males and an increase in the frequency of XY females (Bengtsson, 1977;Bull & Bulmer, 1981).…”

Section: Introductionmentioning

confidence: 82%

“…In the Wood Lemming the progeny of the X*Y females consists of daughters only. This is due to a 100 per cent meiotic drive of the X' chromosome (Fredga et al, 1976(Fredga et al, , 1977 but in the Varying Lemming the X*Y females give birth to approximately 33 per cent of sons (Gileva & Chebotar', 1979).…”

Section: Introductionmentioning

confidence: 99%

Sex ratio, XY females and absence of inbreeding in a population of the Wood Lemming, Myopus schisticolor Lilljeborg, 1844

Gileva

Fedorov

1991

Heredity

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In a Siberian population of the Wood Lemming a considerable excess of females has been observed for three subsequent years of low density. Female-biased sex ratio is associated with a high concentration of the X* chromosome which induces the development of X*Y specimens as females.The frequency of XY females was noticeably higher than that expected at equilibrium under random segregation of sex chromosomes in males and X*XOfemales. Estimates of F1 index were obtained from the frequencies of homozygotes and heterozygotes for the Idh-1 locus and for dimorphic chromosome No. 2. Apparently inbreeding does not contribute to the maintenance of the aberrant genetic system of sex determination in natural populations of Myopus schisticolor.

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“…Fredga et al (1976Fredga et al ( , 1977 have hypothesized a gene on an X chromosome (denoted X* in the following) which suppresses the male determining genes on a Y chromosome and causes a selective nondisjunction in the fetal ovary (a meiotic drive) so that only X* carrying eggs are produced. The X* gene is supposed to have no effect on X*X-females.…”

Section: Some Examples (A) Sex Ratio In Mammalsmentioning

confidence: 99%

“…In the system hypothesis by Fredga et al (1976Fredga et al ( , 1977) three types of matings are possible:…”

Section: Some Examples (A) Sex Ratio In Mammalsmentioning

confidence: 99%

Complexity, Language, and Life: Mathematical Approaches

Casti¹,

Karlqvist²

1986

Biomathematics

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a small group of investigators at the scientific research station at Abisko, Sweden, for the purpose of examining various conceptual and mathematical views of the evolution of complex systems. The stated theme of the meeting was deliberately kept vague, with only the purpose of discussing alternative mathematically based approaches to the modeling of evolving processes being given as a guideline to the participants. In order to limit the scope to some degree, it was decided to emphasize living rather than nonliving processes and to invite participants from a range of disciplinary specialities spanning the spectrum from pure and applied mathematics to geography and analytic philosophy.The results of the meeting were quite extraordinary; while there was no intent to focus the papers and discussion into predefined channels, an immediate self-organizing effect took place and the deliberations quickly oriented themselves into three main streams: conceptual and formal structures for characterizing system complexity; evolutionary processes in biology and ecology; the emergence of complexity through evolution in natural languages. The chapters presented in this volume are not the proceedings of the meeting. Following the meeting, the organizers felt that the ideas and spirit of the gathering should be preserved in some written form, so the participants were each requested to produce a chapter, explicating the views they presented at Abisko, written specifically for this volume. The results of this exercise form the volume you hold in your hand.Special thanks for their help in various phases of organizations of the meeting and arrangement of the publication of this volume are due to M. Olson, P. Sahlstrom, and R. Ouis. December 1985 John Casti, Vienna Anders Karlqvist, StockholmThe International Institute for Applied Analysis is a nongovernmental research institution, bringing together scientists from around the world to work on problems of common concern. Situated in Laxenburg, Austria, IIASA was founded in October 1972 by the academies of science and equivalent organizations of twelve countries. Its founders gave IIASA a unique position outside national, disciplinary, and institutional boundaries so that it might take the broadest possible view in pursuing its objectives:To promote international cooperation in solving problems arising from social, economic, technological, and environmental change To create a network of institutions in the national member organization countries and elsewhere for joint scientific research To develop and formalize systems analysis and the sciences contributing to it, and promote the use of analytical techniques needed to evaluate and address complex problems To inform policy advisors and decision makers about the potential application of the Institute's work to such problemsThe Institute now has national member organizations in the following countries: Complexity and the Evolution of Living SystemsOne of the most evident features distinguishing living from nonliving systems is the tende...

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Fertile XX- and XY-type females in the wood lemming Myopus schisticolor

Cited by 188 publications

References 6 publications

The evolution of XY females in mammals

The evolution of XY females in mammals

Sex ratio, XY females and absence of inbreeding in a population of the Wood Lemming, Myopus schisticolor Lilljeborg, 1844

Complexity, Language, and Life: Mathematical Approaches

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