scholarly journals Correlated responses to selection for wing length in allozyme systems of Drosophila melanogaster

1981 ◽  
Vol 60 (5) ◽  
pp. 317-327 ◽  
Author(s):  
M. Aguadé ◽  
J. Cuello ◽  
A. Prevosti
Keyword(s):  
Drosophila Melanogaster ◽  
Wing Length ◽  
Correlated Responses ◽  
Selection For

scholarly journals SELECTION FOR MALE RECOMBINATION IN DROSOPHILA MELANOGASTER

Genetics ◽  
1976 ◽  
Vol 84 (2) ◽  
pp. 333-351
Author(s):  
Margaret G Kidwell ◽  
J F Kidwell
Keyword(s):  
Drosophila Melanogaster ◽  
Centromeric Region ◽  
Major Effect ◽  
Specific Region ◽  
Correlated Responses ◽  
Male Recombination ◽  
The Third ◽  
High Line ◽  
Two Component ◽  
Selection For

ABSTRACT Two-way selection for male recombination over seven intervals of the third chromosome in Drosophila melanogaster was practiced for nine generations followed by relaxed selection for five generations. Significant responses in both directions were observed but these mainly occurred in early generations in the low line and in later generations in the high line. Divergence of male recombination frequencies between the two selection lines was not restricted to any specific region but occurred in every measured interval of the chromosome. However, right-arm intervals showed a more pronounced response than either left-arm intervals or the centromeric region. Correlated responses in sterility and distortion of transmission ratios occurred as a result of selection for male recombination. Cluster distributions of male recombinants suggested a mixture of meiotic and late gonial events but relative map distances more closely resembled those of the salivary chromosome than standard meiotic or mitotic distances. Patterns of male recombination over time in both second and third chromosomes strongly suggested a major effect associated with the presence of third chromosomes from the Harwich strain. Evidence was also found for modifiers with relatively small effects located in other regions of the genome. The overall results are interpreted in terms of a two-component model of hybrid dysgenesis.

scholarly journals Correlated responses to selection on body size in Drosophila melanogaster

1999 ◽  
Vol 74 (1) ◽  
pp. 43-54 ◽  
Author(s):  
LINDA PARTRIDGE ◽  
ROSALIE LANGELAN ◽  
KEVIN FOWLER ◽  
BAS ZWAAN ◽  
VERNON FRENCH
Keyword(s):  
Growth Rate ◽  
Drosophila Melanogaster ◽  
Body Size ◽  
Larval Development ◽  
Growth Period ◽  
Cell Number ◽  
Correlated Responses ◽  
Larval Weight ◽  
Thorax Length ◽  
Selection For

Correlated responses to artificial selection on body size in Drosophila melanogaster were investigated, to determine how the changes in size were produced during development. Selection for increased thorax length was associated with an increase in larval development time, an extended growth period, no change in growth rate, and an increased critical larval weight for pupariation. Selection for reduced thorax length was associated with reduced growth rate, no change in duration of larval development and a reduced critical larval weight for pupariation. In both lines selected for thorax length and lines selected for wing area, total body size changed in the same direction as the artificially selected trait. In large selection lines of both types, the increase in size was achieved almost entirely by an increase in cell number, while in the small lines the decrease in size was achieved predominantly by reduced cell size, and also by a reduction in cell number. The implications of the results for evolutionary-genetic change in body size in nature are discussed.

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