Seasonal and year-to-year inversion polymorphism in a Southern Greek drosophila melanogaster wild population
✍ Scribed by A. Zacharopoulou; M. Pelecanos
- Publisher
- Springer Netherlands
- Year
- 1980
- Tongue
- English
- Weight
- 514 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0016-6707
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✦ Synopsis
Seasonal and year-to-year variations of the frequency and the types of inversions were studied in a Southern Greek Drosophila melanogaster wild population. Seven samples were taken during the years 1973-1975. The results based on the study of 6,200 chromosome slides may be summarised as follows:
(1) Thirty six different types of inversions were found among which six were cosmopolitan, two are rare cosmopolitan and 28 belong to the rare endemic types of inversions; -(2) The analysis of a sample collected during the spring 1974 revealed for the first time one inversion or, the X-chromosome, In(1)l A;3D and two pericentric inversions, In (3LR) 67E;98F and In (3LR) 71F;90C;-(3) The distribution of the paracentric inversions between the chomosome arms was found to be random, while the breaks within the arms were not randomly distributed. Moreover, a higher total frequency of inversions (13.68%) was scored for the third than for the second chromosome (6.41%);-(4) Seasonal and year-to-year differences in the frequency of inversions were observed only for the second chromosome; further analysis has shown that differences exist when the total number, or the frequency of cosmopolitan inversions are compared. On the contrary, no differences were found over the three years in the total frequency of the third chromosome inversions, while significant changes were revealed in the case of the cosmopolitan and the rare inversions.