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Journal Article

Experimental Studies of the Distribution of Gene Frequencies in Very Small Populations of Drosophila melanogaster: I. Forked

Warwick E. Kerr and Sewall Wright
Evolution
Vol. 8, No. 2 (Jun., 1954), pp. 172-177
DOI: 10.2307/2405641
Stable URL: http://www.jstor.org/stable/2405641
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Experimental Studies of the Distribution of Gene Frequencies in Very Small Populations of Drosophila melanogaster: I. Forked
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Abstract

Ninety-six lines of flies (Drosophila melanogaster) were started, each from 4 females (1 f/f, 2 f/+, 1 +/+) and 4 males (2 f/0, 2 +/0), and continued to fixation or to the sixteenth generation by random selection of 4 females and 4 males as parents of each new generation. Type (f+) became fixed in 41 lines, forked (f) in 29 lines, and 26 lines were still unfixed at the end. The amount of selection against forked was thus slight, although there was evidence that it was greater in the later generations than at first. The rate of fixation (of both alleles combined) reached approximate constancy by the fourth generation at 8.9% per generation. This would imply an effective size of population 83 per cent of that expected under sex linkage with 4 females and 4 males per generation but the reduction is of doubtful significance. In one line, an eye color mutation, probably apricot, appeared in F7 and became fixed in F12, three generations after fixation of the type allele of forked.

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