Comparison of crossbred and purebred selection for a heterotic trait in highly selected populations of Tribolium.
Selection on the basis of crossbred performance (RRS) was compared for 11 generations to within-line selection based on purebred performance (WLS) for a heterotic trait, 13-day larval weight in Tribolium populations previously subjected to 30 generations of purebred selection. RRS crossbreds gained slightly less than crossbreds of WLS populations. RRS purebreds showed a much smaller composite populations were greater than those observed for the continued populations. A model for the genetic control of larval weight is suggested in which there are both dominant and overdominant loci and homozygotes are less fit than heterozygotes.
D000818:Animals; D001835:Body Weight; D003433:Crosses, Genetic; D006579:Heterozygote; D006720:Homozygote; D006823:Hybrid Vigor; D006824:Hybridization, Genetic; D007814:Larva; D008954:Models, Biological; D012641:Selection, Genetic; D013223:Statistics as Topic; D014231:Tribolium