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.

scholarly journals Selection at the Acid Phosphatase Locus in Drosophila Melanogaster

1980 ◽  
Vol 33 (1) ◽  
pp. 97
Author(s):  
R Nassar
Keyword(s):  
Drosophila Melanogaster ◽  
Acid Phosphatase ◽  
Frequency Response ◽  
Gene Frequency ◽  
Correlated Response ◽  
Acid Phosphate ◽  
Frequency Dependent ◽  
Frequency Dependent Selection

Results of fitness estimates at the acid phosphatase locus in D. melanogaster revealed that the observed gene frequency equilibrium at the locus was maintained by frequency-dependent selection. Selection was due mostly to larva-adult viability. Gene-frequency response on media with substrate (IX-naphthyl acid phosphate) added may have been caused in part by selection at the acid phosphatase locus, although the possibility of a correlated response cannot be excluded.

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

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 Genetic loads at a polymorphic locus which is maintained by frequency-dependent selection

1970 ◽  
Vol 16 (2) ◽  
pp. 145-150 ◽  
Author(s):  
Motoo Kimura ◽  
Tomoko Ohta
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Genetic Drift ◽  
Gene Frequency ◽  
Polymorphic Locus ◽  
Small Populations ◽  
Effective Population ◽  
Frequency Dependent ◽  
Frequency Dependent Selection ◽  
Selective Neutrality

SUMMARYIf a polymorphic locus is maintained in finite populations by frequency-dependent selection with selective neutrality at equilibrium, it is generally accompanied by two genetic loads, i.e. the dysmetric and the drift loads. The former arises because the fitness of the population may not be at a maximum at the equilibrium gene frequency and the latter because genetic drift in small populations displaces the gene frequency from its equilibrium value.In some simple models of frequency-dependent selection considered, the drift load is independent of selection coefficients and is approximately equal to (n−1)/(2Ne), where n is the number of alleles and Ne is the effective population size.

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
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