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Segregation and linkage studies of allozyme loci in pair crosses of the oysterCrassostrea virginica

Segregation and linkage studies of allozyme loci in pair crosses of the oysterCrassostrea virginica The genetic control of 11 electrophoretically detected allozyme polymorphisms in the oysterCrassostrea virginica was investigated in 10 pair crosses. For nine allozyme loci, each offspring shared at least one band (electromorph) with each parent. For the remaining two loci (mannosephosphate isomerase and leucine aminopeptidase-2), some offspring failed to share a band with one or both parents. Several lines of evidence indicated that these anomalous results were due to transmission of null alleles. There was evidence of distorted segregation at 8 of the 11 loci. The departures from the Mendelian expectations within the pair crosses might be due either to viability selection in the offspring or to gametic selection in one or both parents, although the possibility that the distortion is due to a locus linked to the allozyme locus cannot be ruled out. However, there was no evidence that heterozygosity per se had an effect on viability of offspring within a cross. Linkage analysis revealed two linkage groups, one consisting of four allozyme loci and the other consisting of three loci. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biochemical Genetics Springer Journals

Segregation and linkage studies of allozyme loci in pair crosses of the oysterCrassostrea virginica

Foltz, David
Biochemical Genetics , Volume 24 (12) – Oct 15, 2004
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References (24)

Publisher
Springer Journals
Copyright
Copyright
Subject
Biomedicine; Human Genetics; Biochemistry, general; Zoology; Medical Microbiology
ISSN
0006-2928
eISSN
1573-4927
DOI
10.1007/BF00554530
Publisher site
See Article on Publisher Site

Abstract

The genetic control of 11 electrophoretically detected allozyme polymorphisms in the oysterCrassostrea virginica was investigated in 10 pair crosses. For nine allozyme loci, each offspring shared at least one band (electromorph) with each parent. For the remaining two loci (mannosephosphate isomerase and leucine aminopeptidase-2), some offspring failed to share a band with one or both parents. Several lines of evidence indicated that these anomalous results were due to transmission of null alleles. There was evidence of distorted segregation at 8 of the 11 loci. The departures from the Mendelian expectations within the pair crosses might be due either to viability selection in the offspring or to gametic selection in one or both parents, although the possibility that the distortion is due to a locus linked to the allozyme locus cannot be ruled out. However, there was no evidence that heterozygosity per se had an effect on viability of offspring within a cross. Linkage analysis revealed two linkage groups, one consisting of four allozyme loci and the other consisting of three loci.

Journal

Biochemical Genetics – Springer Journals

Published: Oct 15, 2004

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