Document Detail

Dynamics of an enzyme polymorphism in the isopod, Sphaeroma rugicauda (Leach). I. Temporal variation in genotype frequencies.
MedLine Citation:
PMID:  6643088     Owner:  NLM     Status:  MEDLINE    
A 27 month study (November, 1978 through January, 1981) of the diallelic enzyme locus, phosphoglucose isomerase (Pgi), in the estuarine isopod Sphaeroma rugicauda (Leach) revealed seasonal changes in the frequencies of the three genotypes (fast/fast, fast/slow and slow/slow). A comparison of genotype frequencies in the newly-released offspring (August) to the frequencies in the same animals ten months later during the breeding season (June), revealed a decline in heterozygote frequency and a corresponding increase in the frequency of the s/s homozygote both of which appeared to be initiated at the onset of winter, a period characterised by low temperatures and salinity. Survivorship experiments in the laboratory suggested that the increase in frequency of the s/s homozygote, at least, could be explained by this genotype being favoured at low temperatures.
J P Edwards; D J Heath
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Heredity     Volume:  51 (Pt 2)     ISSN:  0018-067X     ISO Abbreviation:  Heredity     Publication Date:  1983 Oct 
Date Detail:
Created Date:  1984-01-27     Completed Date:  1984-01-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0373007     Medline TA:  Heredity     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  467-75     Citation Subset:  IM    
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MeSH Terms
Crustacea / enzymology,  genetics*
Gene Frequency
Glucose-6-Phosphate Isomerase / genetics*
Polymorphism, Genetic
Reg. No./Substance:
EC Isomerase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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