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Sex-limited Polymorphisms in Microevolution

Published online by Cambridge University Press:  31 May 2012

P. M. Sheppard
P. M. Sheppard*
Affiliation:
Department of Genetics, University of Liverpool, Liverpool 3, United Kingdom
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Abstract

Theoretical objections to the hypothesis that polymorphisms are evolved as an adaptation by populations are discussed and upheld. Genetic data do not support the assumption that potency balance systems controlling polymorphisms are widespread in the Lepidoptera and are responsible for the prevalence of polymorphisms sex-limited to the female. It is pointed out that such polymorphisms are commoner in butterflies than in moths and that this requires an ecological, not a purely genetical, explanation. It is suggested that the presence of two potency balance systems in the genus Choristoneura could have resulted from an interchange of genetic material between the X-chromosome and an autosome during the evolution of the group.

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Type
Research Article
Information
The Canadian Entomologist , Volume 97 , Issue 4 , April 1965, pp. 442 - 445
Copyright
Copyright © Entomological Society of Canada 1965

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