INTEGRATION OF THE GENOTYPE IN GEOGRAPHIC POPULATIONS OF DROSOPHILA PAVANT
- Author
- Brncic, D.
- Published
- United States : [publisher not identified], 1958.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1958. - Physical Description
- microopaque : positive ; 8 x 13 cm
- Summary
- Crosses were made between geographic races of D. pavani from localities of Chile and Argentina. All these populations were polymorphic for the gene arrangements in chromosomes II, IV-R, and IV-L, owing to the occurrence of inversions. After 10 generations, it was observed that the five parental populations which served as controls had maintained the frequencies of the heterozygotes for the inversions at about the same values as those found in nature. On the other hand, in the nine populations of mixed geographic origin, the frequencies of heterozygotes decreased very significantly. These results suggest that the higher fitness of the inversion heterozygotes depends on the internally balanced gene systems maintained in the invented segments of the chromosomes. Through a process of natural selection, the systems have become different in each Mendelian population. In the interpopulational hybrids these coadapted gene systems are destroyed, owing to crossing over between chromosomes with the same gene orders. As a consequence, the heterozygotes for inversions no longer possess superior fitness. (auth)
- Report Numbers
- TID-6539
- Other Subject(s)
- Collection
- U.S. Atomic Energy Commission depository collection.
- Note
- DOE contract number: AT(30-1)-2465
NSA number: NSA-15-001157
OSTI Identifier 4123698
Research organization: and Chile. Universidad, Santiago. Instituto de Biologia "Juan Noe".
Research organization: Chile. Universidad, Santiago.
View MARC record | catkey: 42247677