Enlemsel Klinlerin Drosophila Melanogaster'de Dca Genotipi Ve Kanat Büyüklüğü Bakımından Araştırılması
Özet
Drosophila melanogasteris a cosmopolitan species that spread over temperate regions. It is
a widely used model organism to study the evolutionary dynamics associated with genetic
and environmental heterogeneity in a broad geographical distribution area. Many characters
are known that are exhibit a latitudinal cline in D. melanogaster. These clines are widely
interpreted as an adaptive result of spatially varying selection. Also body size is a known
character for strong latitudinal cline. Wing size that a decisive parameter for body size are
frequently used in the study of local adaptation and the clinal variations. In this study, in
order to test the hypothesis that the wing size shows a latitudinal cline, variation of wing size
were investigated in natural populations of D. melanogaster which were collected from three
different latitudes, Turkey, Ukraine and Russia. The latitudinal variation of wing size and
also seasonal variation has been investigated and the relationship has been investigated with
the Dca gene, which is thought to be a candidate gene related to wing size.
In this study, 116 lines collected from Turkey, 51 lines collected from Russia and 31 lines
collected from Ukraine, which were subjected to 20 generations of full-sib mating for
iv
inbreeding, were used for determination of latitudinal and seasonal variations of the wing
size and shape.
The results show that wing size show a strong latitudinal cline, and that populations differ
as a result of adapting to temperature with varying latitudes. Besides, the wing size also
varies according to the season in which the populations are collected. In addition, it has been
found that Dca gene shows also a latitudinal cline. However, significant relationship was not
found between the variations of the wing size and the Dca allele polymorphisms.
