Artificial Selection for a Quantitative Trait in Drosophila Melanogaster Populations Treated with X-Rays; SELEZIONE ARTIFICIALE PER UN CARATTERE QUANTITATIVO IN POPOLAZIONI DI DROSOPHILA MELANOGASTER IRRADIATE CON RAGGI X
Technical Report
·
OSTI ID:4231403
S>Selection for high and low number of sternopleural hairs was conducted on x-irradiated plateaued lines of Drosophila to determine in x irradiation can induce new variability for further selection The results showed that in selection for high number of hairs, treatments with high doses of x radiation (3000 r every other generation) were effective in producing a large selection response. Selection in non-irradiated lines were almost ineffective. In the selection for a low number of hairs, the irradiation is ineffective. The selection response in irradiated lines is associated with an increase of genetic variability. In the irradiated lines a strong reduction of fitness (increase of sterility and decrease of fertility) is observed. This decrease in the fitness is caused only in part by specific mutations induced by x radiation, it is associated with the response to the intense selection applied. After a relaxation of the selection and a suspension of the treatment, there is a regression of the average value of the selection characteristic which is stabilized at a higher level, however, than that at the beginning of the experiment. An improvement in the fitness is also observed. The importance of polygene mutability and the importance of the results obtained for plant and animal breeding are discussed. (tr-auth)
- Research Organization:
- Italy. Comitato Nazionale per le Ricerche Nucleari, Milan
- NSA Number:
- NSA-13-021831
- OSTI ID:
- 4231403
- Report Number(s):
- CNB-4
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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