Unmasking frequency-dependent selection in tri-cultures of Drosophila melanogaster

Genetica ◽  
1989 ◽  
Vol 79 (2) ◽  
pp. 77-83 ◽  
Author(s):  
J. C. Adell ◽  
V. Molina ◽  
J. A. Castro ◽  
J. L. Mensua
Keyword(s):  
Drosophila Melanogaster ◽  
Frequency Dependent ◽  
Frequency Dependent Selection

Frequency-Dependent Selection at the Payne Inversion in Drosophila melanogaster

Evolution ◽  
1973 ◽  
Vol 27 (4) ◽  
pp. 558 ◽  
Author(s):  
R. Nassar ◽  
H. J. Muhs ◽  
R. D. Cook
Keyword(s):  
Drosophila Melanogaster ◽  
Frequency Dependent ◽  
Frequency Dependent Selection

scholarly journals FREQUENCY-DEPENDENT SELECTION AT THE LAP LOCUS IN DROSOPHILA MELANOGASTER

Genetics ◽  
1979 ◽  
Vol 91 (2) ◽  
pp. 327-338
Author(s):  
R Nassar
Keyword(s):  
Drosophila Melanogaster ◽  
Gene Frequency ◽  
Frequency Dependent ◽  
Frequency Dependent Selection

ABSTRACT Results of fitness estimates for the Lap locus in Drosophila melanogaster revealed that under crowded media conditions gene frequency equilibrium was maintained by frequency-dependent selection. Evidence was obtained that indicated that mating and egg-to-adult viability were frequency dependent.

Density and frequency-dependent selection on the singed locus of Drosophila melanogaster

Genetica ◽  
1979 ◽  
Vol 50 (3) ◽  
pp. 161-166 ◽  
Author(s):  
Gonzalo Alvarez ◽  
Jos� Fari�a ◽  
Antonio Fontdevila
Keyword(s):  
Drosophila Melanogaster ◽  
Frequency Dependent ◽  
Frequency Dependent Selection

scholarly journals BALANCING SELECTION, INVERSION POLYMORPHISM AND ADAPTATION IN DDT-RESISTANT POPULATIONS OF DROSOPHILA MELANOGASTER

Genetics ◽  
1983 ◽  
Vol 105 (1) ◽  
pp. 87-104
Author(s):  
Phillip T Barnes
Keyword(s):  
Drosophila Melanogaster ◽  
Balancing Selection ◽  
Aldehyde Oxidase ◽  
Selective Advantage ◽  
Heterozygote Advantage ◽  
Allozyme Polymorphism ◽  
Frequency Dependent ◽  
Frequency Dependent Selection ◽  
Laboratory Populations ◽  
Environmental Component

ABSTRACT The modes of selection important in maintaining an inversion-allozyme polymorphism in two laboratory populations of Drosophila melanogaster were examined. The populations, 731R and J2, are highly resistant to DDT. The polymorphism involves the Standard and In(3R)P chromosomal arrangements in very strong linkage association with the AO  1 and AO  4 allozymes, respectively, of the aldehyde oxidase locus—The mean fertilities of the three karyotypes were not significantly different in 731R, but, in J2, In/In was significantly inferior to St/St and St/In. Egg-to-adult viability tests indicated very strong heterozygote advantage at all frequency combinations of the karyotypes in both populations when DDT was present. When DDT was excluded, the viabilities varied over the frequency combinations but were not inversely correlated with karyotype frequency, as predicted by balancing frequency-dependent selection. Discrete, multiple-generation experiments showed a rapid increase in heterozygote frequency to about 80% in both populations when DDT was present. Without DDT, 731R showed apparent directional selection favoring St, whereas J2 showed persistence of the polymorphism, although with extensive fluctuation.—Thus, the inversion-allozyme polymorphism is directly involved in the adaptation to a specific environmental component, DDT, and the selective advantage of the heterozygotes is the important balancing force. Balancing frequency-dependent selection was not observed, which suggests the hypothesis that this form of selection may not be involved in adaptation to novel environmental conditions.

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