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Hybrid dysgenesis in natural populations of Drosophila melanogaster in Japan. II. Strains which cannot induce P-M dysgenesis may completely suppress functional P element activity

Published online by Cambridge University Press:  14 April 2009

Nobuko Hagiwara
Affiliation:
Department of Biology, Ochanomizu University, Bunkyo-ku, Tokyo 112, Japan
Etsuko Nakamura
Affiliation:
Department of Biology, Ochanomizu University, Bunkyo-ku, Tokyo 112, Japan
Etsuko T. Matsuura
Affiliation:
Department of Biology, Ochanomizu University, Bunkyo-ku, Tokyo 112, Japan
Sadao I. Chigusa*
Affiliation:
Department of Biology, Ochanomizu University, Bunkyo-ku, Tokyo 112, Japan
*
2To whom correspondence should be addressed.
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Many inbred and isofemale lines derived from wild populations of Drosophila melanogaster were tested for gonadal dysgenic sterility, male recombination and snw secondary mutation. Among them, we have found strains whose dysgenic offspring show negligible sterility, and undetectable male recombination and snw mutation. They can be considered to be neutral strains in the strict sense. Such neutral strains appear to carry only defective P elements in their genomes. Taking the observations of Karess & Rubin (1984) into account, it is suggested that some defective P elements retain the function necessary for P cytotype. Cytotype determination mechanisms are discussed.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1987

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