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REPRODUCTION IN CAGE POPULATIONS OF A POLYMORPHISM REGULARLY OBSERVED IN THE NATURAL POPULATIONS OF DROSOPHILA MELANOGASTER IN FRANCE
Annie Fleuriet 1
1 Laboratoire de Génétique, Université
de Clermont Ferrand II, B.P. 45, 63170 Aubière, France
Polymorphism for both alleles of a gene ref(2)P, which
is a usual trait of French natural populations of Drosophila melanogaster
, can be reproduced in experimental conditions. ref(2)P is a
gene for resistance to the hereditary, noncontagious Rhabdovirus 
,
responsible for CO2 sensitivity in Drosophila melanogaster
. The equilibrium frequencies observed in cages are the same as in the
wild, whether virus is present or not. The rapid rate of return to
these equilibrium frequencies indicates that strong forces, which remain to
be determined, are responsible for the maintenance of this polymorphism.
Revised on December 12, 1977