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Hybrid dysgenesis in Drosophila melanogaster: the evolution of mixed P and M populations maintained at high temperature

Published online by Cambridge University Press:  14 April 2009

Phillip K. Kiyasu  and
Margaret G. Kidwell
Phillip K. Kiyasu
Affiliation:
Division of Biology & Medicine, Brown University, Providence, R.I. 02912, U.S.A.
Margaret G. Kidwell
Affiliation:
Division of Biology & Medicine, Brown University, Providence, R.I. 02912, U.S.A.
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The ability of hybrid dysgenesis P factors to survive and multiply under conditions of strong negative sterility selection was studied in mixed P and M laboratory cultures. Eight populations were initiated with varying proportions of P and M strains. Mixed populations and controls were maintained for seventeen generations at 27 °C, a temperature sufficiently high to induce maximum frequencies of sterility in dysgenic hybrids. The two components of dysgenesis, P factor activity and cytotype, were monitored every generation for the first ten generations and intermittently thereafter. With one exception, all the mixed populations evolved to the P type indicating that P factors can survive and multiply, despite low initial frequency and strong negative selection against dysgenic hybrids. However, the average level of P factor activity attained at equilibrium was considerably lower than that of the P strain control population maintained under the same conditions. It was also lower than the equilibrium level of P factor activity attained in a similar experiment carried out at a lower temperature, suggesting that selection favoured P factors with weak rather than strong sterility potential.

Type
Research Article
Information
Genetics Research , Volume 44 , Issue 3 , December 1984 , pp. 251 - 259
Copyright
Copyright © Cambridge University Press 1984

References

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