The effect of inbreeding on the redistribution of genetic variance of fecundity and viability in Tribolium castaneum
Frenandez, A. | Toro, M.A. | Lopez-Fanjul, C.
Inbreeding was carried out to investigate the genetic properties of fecundity and viability (early and late) in a population of Tribolium castaneum. Heritability estimates in the base population were intermediate for fecundity and small and nonsignificant for viability. All traits showed strong inbreeding depression. For both viability traits, a significant increase of both within-line additive variance and between-line variance was observed with inbreeding. For fecundity, however, these changes were not detected. The results are compatible with the genetic variance of viability in the base population being generated by segregation of a number of deleterious recessive alleles at low frequencies. For fecundity, an additional class of loci with substantial additive effects must be postulated.
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