THE INVESTIGATION OF THE GENETIC STRUCTURE OF POPULATIONS. Period covered October 1, 1959-October 1, 1960
Technical Report
·
OSTI ID:4111141
A discussion is presented of the results of three experiments on the viability effects of newly induced mutations. Two of these experiments deal with the X-chromosome of Drosophila melanogaster. In brief, males that carry irradiated X-chromosomes have lower viabilities than males with nonirradiated chromosomes. This is true at all levels of radiation used: 500, 1000. and 2000 r. Females carrying a single irradiated chromosome are affected only slightly, if at all, by mutations on this chromosome. If all six tests listed in Tables 2 and 3, which involve nearly 750,000 individuals, are averaged, the observed frequency of control and "x-ray" females, a measure of their relative viabilities, is identical (54.4%). The third experiment is a more complex study of second- chromosome viability mutations. This experiment is designed to test chromosomes of different geographic origin, different combinations of these chromosomes (homozygous, intra and interpopulation heterozygous combinations) and four levels of x radiation (including 0 r, the control). Summarized data, although extensive, only permit a conclusion to be drawn that expectations based on the gross manipulation of chromosomes in the mating scheme are fulfilled and that homozygous and intrapopulation heterozygous combinations seem to react differently to the presence of newly induced mutations. The results of the interpopulation combinations (wild-type and tions based on the gross manipulation of chromosomes in the mating scheme are fulfilled and that homozygous and intrapopulation heterozygous combinations seem to react differently to the presence of newly induced mutations. The results of the interpopulation combinations (wild-type and CyL/+) do not seem to agree with each other or with predictions based on any simple model of population genetics. (auth)
- Research Organization:
- New York State Coll. of Agriculture, Ithaca
- NSA Number:
- NSA-15-005876
- OSTI ID:
- 4111141
- Report Number(s):
- TID-11062
- Country of Publication:
- United States
- Language:
- English
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