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Dosage effects on heritability and maternal effects in diploid and triploid Chinook salmon (Oncorhynchus tshawytscha)
- Source :
- Great Lakes Institute for Environmental Research Publications
- Publication Year :
- 2007
- Publisher :
- Scholarship at UWindsor, 2007.
-
Abstract
- Induced triploidy (3N) in salmon results from a blockage of maternal meiosis II, and hence provides a unique opportunity to study dosage effects on phenotypic variance. Chinook salmon families were bred using a paternal half-sib breeding design (62 females and 31 males) and half of each resulting family was treated to induce triploidy. The paired families were used to test for dosage effects (resulting from triploidy) on (1) the distribution and magnitude of phenotypic variation, (2) narrow-sense heritability and (3) maternal effects in fitness-related traits (i.e., survival, size-at-age, relative growth rate and serum lysozyme activity). Quantitative genetic analyses were performed separately for diploid and triploid family groups. Triploidization resulted in significantly higher levels of phenotypic variance and substantial differences in patterns of variance distribution for growth and survival-related traits, although the patterns were reversed for lysozyme activity. Triploids exhibited higher narrow sense heritability values relative to diploid Chinook salmon. However, maternal effects estimates were generally lower in triploids than in diploids. Thus, the dosage effects resulting from adding an extra set of chromosomes to the Chinook salmon genome are primarily additive. Somewhat counterintuitively, however, the relative magnitude of the combined effects of dominance, epistasis and maternal effects is not affected by dosage. Our results indicate that inheritance of fitness-related quantitative traits is profoundly affected by dosage effects associated with induced triploidy, and that triploidization can result in unpredictable performance and fitness outcomes.
- Subjects :
- Male
growth
Mothers
Marine Biology
Quantitative trait locus
survival
Polyploidy
Quantitative Trait, Heritable
Salmon
Dosage Compensation, Genetic
Genetics
Animals
Biology
Genetics (clinical)
Biochemistry, Biophysics, and Structural Biology
phenotypic variance
Dosage compensation
biology
Meiosis II
Maternal effect
ploidy
Life Sciences
Biodiversity
Heritability
biology.organism_classification
Diploidy
Phenotype
dosage compensation
Oncorhynchus
Epistasis
Female
Ploidy
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Great Lakes Institute for Environmental Research Publications
- Accession number :
- edsair.doi.dedup.....2acc4e4ace3896d3e22a960da22f2de1