An experimental study of genetic drift for two quantitative traits in Tribolium [castaneum]

Genetic drift for two quantitative traits, pupal weight and reproductive fitness as measured by progeny numbers, was investigated in 48 populations of Tribolium castaneum randomly mated over 20 generations. The experiment involved 12 replicate populations for each of four constant sizes (5, 10, 25,...

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Bibliographic Details
Published in:The Journal of heredity 1984-05, Vol.75 (3), p.191-195
Main Authors: Rich, S.S, Bell, A.E, Miles, D.A, Wilson, S.P
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Classical genetics, quantitative genetics, hybrids
Fundamental and applied biological sciences. Psychology
Genetics of eukaryotes. Biological and molecular evolution
Invertebrata
Tenebrionidae
Tribolium castaneum
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Summary:Genetic drift for two quantitative traits, pupal weight and reproductive fitness as measured by progeny numbers, was investigated in 48 populations of Tribolium castaneum randomly mated over 20 generations. The experiment involved 12 replicate populations for each of four constant sizes (5, 10, 25, and 50 pairs of parents) with both traits observed each generation on a random sample of offspring. Observed drift variances for both traits, calculated each generation as the variance among the means of replicate populations were significantly less than those theoretically expected from estimates for additive genetic variance and effective population size. Stabilizing selection, arising from an intermediate phenotype being favored by natural selection, appeared to be the major factor countering genetic drift.
ISSN:0022-1503
1465-7333
DOI:10.1093/oxfordjournals.jhered.a109910