초파리 集團內의 近親交配度와 距離의 關係

林洛龍 全北大學校 1976 論文集 Vol.18 No.-

The purpose of this experiment is to research the maintenance mechanism of the genetic variabilities through the study on the relation between the distance and the allelism of lethals from the heterozygous lethal carriers in a korean population of Drosophila melanogaster. The fruitflies were captured within 30 minutes and each 7 traps were linearly set up in 30 meter intervals. The males of collected flies were balanced with A_1B_18 strains used by Wallace et al., (1966), and this stocks are lethal in homozygous conditions and contains reciprocal 2-3 translocations. A single F_1(Cy L-UbX)/(++) male from the cross between a wild male and three A_1B_18 females were backcross with A_1B_18 females. The obtained F_2(Cy L-UbX)/(++) flies were brother and sister mating, and the next generation F_3 flies were counted. If lethal genes were on second and third chsomosomes or both, the normal phenotype flies do not survive. The results of the present works are: 1. "Genome" lethals frequency were estimated to 50.0%. 2. Of all the 6,551 crosstests, observed average allelic rate was 2.38%. 3. The log of the frequency of allelism due to inbreeding declines linearly with the square root of distance. 4. The zero-point "genome" allelism at a given moment was estimated to 3.64%. The rate of elimination of lethal "genome" by homozygous condition was 0.0091, or nearly 0.01. 5. In this data, we may assume that the fithness of the lethal heterozygotes in korean population are an very near equilibrium with that of normal heterozygotes or silghtly deleteriousness. 6. It is suggested that the inbreeding coefficient is not negligible. This data is in agreement with the assertions of Wallace(1966) and Paik et al.,(1968).

솔잎혹파리의 정자형성 과정중의 염색체 행동

林洛龍 全北大學校 生物學硏究所 1983 生物學硏究年報 Vol.4 No.-

A study dealt cytologically with spermatogenetic chromosome cycle and salivary gland cells clear up some biological peculiarities of Thecodiplosis japonensis, Cecidomyiidae ; Diptera, which is noxious insect to pine trees, especially Pinus densiflora. the somatic nucleus of both males and females contain eight chromosomes, while in male germ-line cells, two different polyploids ; hexaploidy and decapoidy, were found it is that based on the haploid of four chromosomes. In this gall midges, among 24 chromosomes in each germ-line cell, eight are S-chromosomes and 16 of E-chromosomes. Therefore, 24 chromosomes would be spermatogonial proper figures, 40 would be the endomitotic remainder just after first meiotic division. consequently, only one secondary spermatocyte which has the chromosomes originated from father's haploid made two spermatids. Thedetails of the results are discussed in the text.

톡톡이 Tomocerus kinoshitai(Collembola)의 精子形成過程에서의 染色體週期 및 唾腺染色體에 關한 硏究

林洛龍 全北大學校 生物學硏究所 1981 生物學硏究年報 Vol.2 No.-

Cytological investigations were performed to clarify the karyotype of the somatic cells and behavior of the spermatogonial chromosomes in the spermatogenesis of Tomocerus kinoshitai, Collembola. Among the specimens used in this study, those kept in constant room temperature(25±1℃) during winter were tested from mid November to the next May, and for cytological preparations the routin aceto-orcein and feulgen methods were employed. Tomocerus kinoshitai had a hexaploid germ-line in the male gonads, and its karyotype of both male and female was composed of 12 chromosomes in each somatic cells ; however, their large nuclei exhibited abundant chromatin diffusions, which were probably resulted from polyploidy.

韓國 초파리 集團內의 SD因子에 관하여

林洛龍 全北大學校 1974 論文集 Vol.16 No.-

For population genetics, the explanation of maintenance mechanism of genetic variations concealed in natural D.melanogaster population is one of the most important problem. The genes that induced meiotic drive were discovered by Crow & Hiraizumi in experiments in Madison population. In Korean population, the SD gene was hinted by Paik & Chung. For estimation of frequency of SD gene, wild males were crossed to cn bw females : males of F_1 progenies selected and individually test-crossed to cn bw females. The number of F_2 progeny was then counted to detect any segregation ratio.

초파리集團의 相同染色體上의 逆位頻度

林洛龍,李泰勳 全北大學校 生物學硏究所 1983 生物學硏究年報 Vol.4 No.-

A chromosome study for inversion polymorphisms from Naju populations of D. melanogaster uncovered thirteen inversions. Among them, 6 were common cosmopolitan, six endemic of the rest seven were firstly discovered in these samples. Two were in X-chromosome and eleven were in two autosomes, except for fourth chromosome. Frequency of males carrying inverted chromosomal segment of one and more is 34.77%, and that of mean per individual male is 40.97%. No linkage disequilibrium present in both major autosomes from twp samples.

초파리集團의 逆位多型現象

林洛龍 全北大學校 生物學硏究所 1980 生物學硏究年報 Vol.1 No.-

Inversion studies of three yearly natural populations of Drosophila melanogaster from Jeonju area discovered 19 paracentric inversions in the heterozygous condition. Six were cosmopolitan and the rest 13 were new and generally endemic. One of the non cosmopolitan ones was on the X chromosome, 18 inversions were found in the two autosomes ; Six inversions were on the second chromosome and twelve on the third chromosome. In the three yearly samples, the files carried one or more heterozygous inversions were 36.2, 28.7, and 33.1%, respectively. Totally, therefore, the mean frequency was 32.4%. The rate of observed inversion frequencies, chromosome 2 vs. 3 was about 7 : 3. The difference of relative frequencies in the two autosomes suggested that the differential adaptive force may present between the chromosome 2 and 3.

초파리 自然集團內의 逆位多型現上

林落龍 全北大學校 基礎科學硏究所 1979 基礎科學 Vol.2 No.1

Drosophila immigrans populations of Jeonju have been analyzed for inversion polymorphism. A total of 648 larvae collected from large vineyard in Jeonju area in October 1975 and November 1976 were examined for the type and frequency of inversions. Only two types of cosmopolitan inversions in chromosome 2 were observed in present study. The amount of average individual heterozygosity for inversions is similar between the two samples, with the mean of 0.15. The average frequency of inversion A, 10.0% is significantly higher than that of inversion B, 4.8%. Jeonju populations of D. immigrans are different from central popultion of Korea in inversion frequencies. Reasons why this difference is observed between the local populations have been briefely discussed.

초파리 自然集團內의 染色體變異에 關한 硏究

林洛龍,李秉順 全北大學校 敎育大學院 1986 敎育論叢 Vol.6 No.-

Inversion variations and those frequencies in a Jeonju natural population of Drosophila melanogaster were studied. From a total of 520 files tasted, 245 males and 275 females, 13 different inversions were found to be two major autosomal and paracentric only, except for X and 4th chromosomal as well as pericentric and the other chromosomal aberrations. Among the polymorphic inversions we found, four were common cosmopolitan ones, four rare cosmopolitans, three recurrent endemics and two unique endemics. And an overlapping inversion was observed and identified as overlapped with cosmopolitan In(3R) Mo and In(3R)P. The frequency of wild files carrying one or more inversions and the mean number of inversions per individual was 0.495 and 0.54 in the egg samples, and 0.374 and 0.51 in the male samples, respectively. However, the majority of inversion frequencies was led by common types of cosmopolitans. Some nonrandom associations of inversions appeared between chromosome 2 and 3, 2R vs. 3R(P〈0.01) in egg samples and 2L vs. 3R(P〈0.01) in male samples, but in an average showed randomness in both male and female tests. In male test, on the other hand, it seems that a significant linkage disequilibrium detected in the third chromosome was due probably to the coupling of In(3L)P and In(3R)P, with significant at 1% level. Although the shortages of homozygotes, with indices of deficiency homozygous both standard and inverted sequences, were estimated to be 3 to 6%, the statistical significances did not recognize from the Hardy-Weinberg principle.

Bacillus subtilis sporangiospore를 이용한 cheese 제조에 관한 연구

임낙용(Nac-Ryong Rim),박충웅(Chung-Ung Park),황호관(Ho-Gwan Hwang) 한국식품영양과학회 1975 한국식품영양과학회지 Vol.4 No.1

Year-to-Year Inversion Polymorphism in a Southern Korea Drosophila melanogaster Wild Population

김남우,임낙용 한국유전학회 2004 Genes & Genomics Vol.26 No.2