Document Detail

Dynamics of an enzyme polymorphism in the isopod, Sphaeroma rugicauda (Leach). II. Sexual, gametic and fecundity selection.
MedLine Citation:
PMID:  6643089     Owner:  NLM     Status:  MEDLINE    
The estuarine isopod Sphaeroma rugicauda (Leach) exhibits a diallelic polymorphism at the locus coding for the enzyme Pgi. An investigation carried out during the animal's breeding season (June-July) in 1979 and 1980 indicated that the animals were mating at random. It also showed the s/s-homozygote females to be the earliest to release offspring and to be the most fecund of the three genotypes (f/f, f/s and s/s). Further, data from the wild population in 1980 and laboratory experiments indicated that male s-gametes were selected against in s/s females, resulting in offspring ratio distortions in f/s (male) X s/s (female) crosses, in favour of heterozygotes. The net effect of these selective pressures did not, however, significantly alter the genotype frequencies (found in the offspring) from expected values.
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:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0373007     Medline TA:  Heredity     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  477-86     Citation Subset:  IM    
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MeSH Terms
Crustacea / enzymology,  genetics*
Glucose-6-Phosphate Isomerase / genetics*
Polymorphism, Genetic
Selection, Genetic
Reg. No./Substance:
EC Isomerase

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

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