DEVELOPMENTAL-GENETIC STUDY OF THE EFFECTS OF X-RAY IRRADIATION IN DROSOPHILA VIRILIS AND BUFO VALLICEPS. Final Scientific Report, January 1, 1955-December 31, 1960
Technical Report
·
OSTI ID:4067768
ABS>Normal spermatogenesis in Drosophila virilis was studied by examining living cells by phase-contrast microscopy. Primary spermatocytes were observed to occur in cysts of eight cells. Histological analysis of sections from adult males indicated a two-day cycle in meiosis until the males are sexually mature at six days. Following the sixth day the number of immature cells in the testes decreased steadily without further peaks in the number of primary spermatocytes on alternate days. Spermatozoa were not motile and functional until the sixth day. Typical configurations of chromosomes during spermatogenesis, in spermatogonia, spermatocytes, and very early spermatids are presented. Results are included from a series of tests to determine the effects of irradiation on Drosophila virilis males as measured by dominant lethal and translocation rates in cells at various stages of spermatogenesis and sperm differentiation. Males at different ages were irradiated under similar conditions and mated with mature virgin females within one hour after irradiation and left for five days. After this preliminary period, during which no fertile eggs were deposited, the males were remated to mature virgin females and daily egg counts were made. After a two-day mating period, the males were remated and egg counts made. This procedure was continued for a total of eight consecutive mating periods. Data are tabulated on rates of dominant lethals resulting from irradiation during various stages of spermatogenesis. ( C.H.)
- Research Organization:
- Arkansas. Univ., Fayetteville. Coll. of Arts and Sciences
- NSA Number:
- NSA-15-014119
- OSTI ID:
- 4067768
- Report Number(s):
- ORO-373
- Country of Publication:
- United States
- Language:
- English
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