Selection for Higher Fitness in Populations of Drosophila pseudoobscura

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Science  12 Apr 1968:
Vol. 160, Issue 3824, pp. 199-200
DOI: 10.1126/science.160.3824.199


Four laboratory populations, each consisting of flies homozygous for a wild second chromosome, were maintained in population cages. Three of them were initially characterized by low fecundity of the females; the fourth was a control. After 15 months, in all three populations with low fecundity this character was much improved; two of them, have reached the control level. The changes observed were presumably due to mutation and selection under highly competitive conditions.