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Variance component analysis for viability in an isolated population of Drosophila melanogaster*

Published online by Cambridge University Press:  14 April 2009

Hidenori Tachida ,
Muneo Matsuda ,
Shin-Ichi Kusakabe  and
Terumi Mukai
Hidenori Tachida
Affiliation:
Department of Biology, Kyushu University 33, Fukuoka 812, Japan
Muneo Matsuda
Affiliation:
Department of Biology, Kyushu University 33, Fukuoka 812, Japan
Shin-Ichi Kusakabe
Affiliation:
Department of Biology, Kyushu University 33, Fukuoka 812, Japan
Terumi Mukai*
Affiliation:
Department of Biology, Kyushu University 33, Fukuoka 812, Japan
*
‡ To whom correspondence should be addressed.
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Using the 602 second chromosome lines extracted from the Ishigakijima population of Drosophila melanogaster in Japan, partial diallel cross experiments (Design II of Comstock & Robinson, 1952) were carried out, and the additive genetic variance and the dominance variance of viability were estimated. The estimated value of the additive genetic variance is 0·01754±0·00608, and the dominance variance 0·00151±0·00114, using a logarithmic scale. Since the value of the additive genetic variance is much larger than expected under mutation–selection balance although the dominance variance is compatible with it, we speculate that in the Ishigakijima population some type of balancing selection must be operating to maintain the genetic variability with respect to viability at a minority of loci. As candidates for such selection, overdominance, frequency-dependent selection, and diversifying selection are considered, and it is suggested that diversifying selection is the most probable candidate for increasing the additive genetic variance.

Type
Research Article
Information
Genetics Research , Volume 42 , Issue 2 , October 1983 , pp. 207 - 217
Copyright
Copyright © Cambridge University Press 1983

Footnotes

*

Paper no. 17 from the Laboratory of Population Genetics, Faculty of Science, Kyushu University 33, Fukuoka, Japan.

References

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