The genotype frequencies of one-year-old oyster spat
(Crassostrea gigas) from parents of known genotype, are compared
to the frequencies expected with Mendelian inheritance. The genotypes
are characterized at three enzyme loci, Aspartate amino-transferase
(AAT), Phosphohexose isomerase (PHI) and Leucine
aminopeptidase (LAP), and a general protein locus. In this study
expression of these loci as histochemically stained patterns on a gel
following electrophoresis is controlled by two codominant alleles at
each locus.
Frequencies of the genotypes at all four loci, in all offspring
groups investigated, are not statistically different from those
expected with Mendelian inheritance, supporting the hypothesis that
this is the method of inheritance. It is further concluded that there
are no large amounts of selection connected with any of these loci.
An additional observation, that there is no statistical difference
between genotype ratios of siblings in two different growing areas,
is discussed in terms of G. Williams' (1975) "elm-oyster" model.
It is suggested that the search for selection at single loci is probably
not a generally useful one for the oyster breeder. / Graduation date: 1977
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37146 |
| Date | 30 July 1976 |
| Creators | Smoker, Janet Van Dusen |
| Contributors | Lannan, James E. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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