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Artificial Selection on a Fitness-Component in Drosophila melanogaster
Michael R. Rose
Vol. 38, No. 3 (May, 1984), pp. 516-526
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2408701
Page Count: 11
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The apparent maintenance of significant additive genetic variances for components of fitness is one of the major puzzles to have come out of recent research on the quantitative genetics of fitness. This issue was addressed by means of artificial selection for increased early fecundity in a Drosophila melanogaster population which had been maintained under stable conditions for over 100 generations. An initial direct response to artificial selection indicated that this population could be maintaining the genetic variability for fecundity which had been detected earlier by means of sib analysis, but the response was not sustained in later generations. Crossing selected with selected lines and control with control lines resulted in the recovery of the initial response to artificial selection, suggesting that inbreeding may have had significant effects. The results of selection-relaxation provided no evidence of natural selection acting to erase the gains achieved by artificial selection. A variety of hypotheses for explaining these results are tenable. Deciding between them requires further experimentation. In particular, it did not prove possible to test the antagonistic pleiotropy hypothesis for the maintenance of genetic variation for fitness components.
Evolution © 1984 Society for the Study of Evolution