No bilateral asymmetry in wild-caught, endangered Poeciliopsis o. occidentalis (Gila topminnows)
Article Abstract:
Support for the hypothesis that some unknown, perhaps unnatural, environmental factor in a given laboratory has been responsible for differences found in bilateral asymmetry in samples of fish taken from two springs is presented. Bilateral asymmetry is not found in wild-caught Poeciliopsis o. occidentalis (Gila topminnows). This fish species, found in Arizona, has been considered a well-known example of positive association between genetic variation level and fitness in endangered species.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Female choice and variation in the major histocompatibility complex
Article Abstract:
Two previous reports have claimed that female mice prefer to mate with males carrying different major histocompatibility complex traits. A symmetrical balancing-selection model describing these apparent preference of female mice is developed and analyzed. Results indicate that female choice reduces the frequency of homozygotes in the population. The model indicates that all homozygotes are non-preferentially selected against and that all heterozygotes are non-preferentially selected for.
Publication Name: Genetics
Subject: Biological sciences
ISSN: 0016-6731
Year: 1992
User Contributions:
Comment about this article or add new information about this topic:
Factors influencing the extent of inbreeding depression: an example from Scots pine
Article Abstract:
In a study of Scots pine the level of inbreeding depression was much lower in northern than in southern populations in Finland. Population genetic factors might account for the difference, and whether that is so has been studied theoretically. It seems likely stronger selection against heterozygotes or higher selfing in the northern population at biologically reasonable levels in both cases bring changes consistent with observed differences.
Publication Name: Heredity
Subject: Biological sciences
ISSN: 0018-067X
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Biochemical plasticity in the Arizona Tiger Salamander (Ambystoma tigrinum nebulosum) Evolutionary ecology of facultative paedomorphosis in newts and salamanders
- Abstracts: The role of heterochromatin in the expression of a heterochromatic gene, the rolled locus of Drosophila melanogaster
- Abstracts: Induction of melanin biosynthesis in Vibrio cholerae. Polyphosphate stores enhance the ability of Vibrio cholerae to overcome environmental stresses in a low-phosphate environment
- Abstracts: Nisin production by a mixed-culture system consisting of Lactococcus lactis and Kluyveromyces marxianus. Electrochemical Ag+ for preservative use
- Abstracts: PS2 integrin requirements in Drosophila embryo and wing morphogenesis. Characterization of mutant alleles of myospheroid, the gene encoding the beta subunit of the Drosophila PS integrins