Open AccessTEMPERATURE-RELATED DIVERGENCE IN EXPERIMENTAL POPULATIONS OF DROSOPHILA MELANOGASTER. I. GENETIC AND DEVELOPMENTAL BASIS OF WING SIZE AND SHAPE VARIATION
Author(s) -
Sandro Cavicchi,
Daniela Guerra,
Gianfranco Giorgi,
Cristina Pezzoli
Publication year - 1985
Publication title -
genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.792
H-Index - 246
eISSN - 1943-2631
pISSN - 0016-6731
DOI - 10.1093/genetics/109.4.665
Subject(s) - wing , biology , drosophila melanogaster , evolutionary biology , divergence (linguistics) , selection (genetic algorithm) , population , stabilizing selection , drosophila (subgenus) , genetics , genetic divergence , compartment (ship) , genetic variation , gene , genetic diversity , demography , linguistics , philosophy , artificial intelligence , sociology , computer science , engineering , aerospace engineering , oceanography , geology
The effects of environmental temperature on wing size and shape of Drosophila melanogaster were analyzed in populations derived from an Oregon laboratory strain kept at three temperatures (18 degrees , 25 degrees , 28 degrees ) for 4 yr. Temperature-directed selection was identified for both wing size and shape. The length of the four longitudinal veins, used as a test for wing size variations in the different populations, appears to be affected by both genetic and maternal influences. Vein expression appears to be dependent upon developmental pattern of the wing: veins belonging to the same compartment are coordinated in their expression and relative position, whereas veins belonging to different compartments are not. Both wing and cell areas show genetic divergence, particularly in the posterior compartment. Cell number seems to compensate for cell size variations. Such compensation is carried out both at the level of single organisms and at the level of population as a whole. The two compartments behave as individual units of selection.