• The Korean Journal of Malacology
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• v.11 no.2
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• pp.171-179
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• 1995

한국산 다슬기류의 종별 유전적 변이를 알아보고 계통분류학적 근거를 제공하기 위하여 다슬기속(Simisulcospira)에 속하는 다슬기(S. libertina),주름다슬기,(S. forticosta), 곳체다슬기(S. gottschei), 좀주름다슬기(S. tegulata)및 참다슬기(S. coreana)등 5종을 전국 각지에서 채집하여 전기영동(starch gelelectrophoresis)를 이용해 분자유전학적 분석을 실시한 결과를 용약하면 아래와 같다. 유전적 다형형의 빈도는 58%에서 83%로 대단히 높았고 이형접합자의 평균 빈도도 50%내외였다. Rogers' D를 근거로 한 각 종간 유연관계는 주름다슬기와 곳체다슬기가 근연관계를 이루고 있었으며 이들 두 군과 다슬기는 유전적으로 거리를 두고 있었다. 이러한 결과는 패각의 형채와 비교할 때 유사한 경향을 보였다.

• Journal of Animal Science and Technology
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• v.50 no.1
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• pp.27-32
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• 2008

The objective of this study was to estimate genetic trend on racing time of Thoroughbred racehorses in Korea, using a total of 209,725 racing records of 9,934 racehorses collection from January, 1990 to December, 2006. Phenotypic trends for all distances were negative at a rate of －0.148, －0.137, －0.137 and －0.139 second per race year for distances of 1,000m, 1,400m less than, 1,700m more than and overall dataset, respectively. Environmental trends were similar to phenotypic ones in all distances and trends in permanent environmental and jockey effects by race year were not found. Average genetic improvements for racing time were －0.037 and －0.030 second per race year at the 1,000m and overall dataset, respectively, which is low. But Genetic trends were decreased consistently. There is need to establish the genetic improvement program for quality of racehorses.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2022.09a
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• pp.72-72
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• 2022

자두나무(Prunus salicina Lindl.)는 세계에서 5번째로 많이 생산되는 과실로, 한국에서 재배하는 자두나무의 기본종은 중국 양쯔강 유역에서 기원했다. 2016년 과수용 자두나무와는 다른 자두나무가 양구에서 발견되었다. 양구군, 인제군, 고성군 일대의 자두나무 개체군의 유전다양성 및 집단 구조 분석을 통해 본 자두나무 개체군의 유전다양성 및 개체군 구조를 확인하고자 했다. 과수용 재배종을 포함한 시료를 채취하여 GBS 분석을 진행했고 주성분 분석과 STRUCTURE 분석을 통해 개체군간 유전적 구조를 확인했다. 재배종의 유전형이 다른 개체군에서도 나타나는 것으로 보아 유의한 유전적 분화가 일어났다고 보기 힘들었다. 하지만 고성군 고진동계곡 등 DMZ에 인접한 집단이 분계도에서 재배종 개체군과 가장 유전적 거리가 있는 것으로 나타났다. 하지만 본 분석으로는 야생집단으로 발견도니 자두나무의 실체와 기원을 단정짓기에는 부족한 것으로 보이며 외군 추가 및 더 많은 시료를 확보하는 등 추가 조사와 분석이 필요하다.

• Journal of Life Science
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• v.22 no.11
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• pp.1493-1499
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• 2012

The level of genetic variation and relationships in three native Korean goat populations (Dangjin, Jangsu, and Tongyeong) as well as the populations of a farm were analyzed, based on 30 microsatellite markers. A total of 277 distinct alleles were observed across the four goat populations, and 102 (36.8%) of these alleles were unique to only one population. The mean observed heterozygosity and polymorphism information content were calculated as 0.461~0.651 and 0.462~0.679, respectively. In the NJ tree constructed based on Nei's $D_A$ genetic distance, the four populations represented four distinct groups. However, the genetic distances between each Korean native goat population and the farm population were two times those among the three native Korean breeds. The genetic structure within the three Korean native goat populations was also investigated. Cluster analysis, using the STRUCTURE software, suggested three clusters. The molecular information of genetic diversity and relationships in this study will be useful for the evaluation, conservation, and utilization of native Korean goat breeds as genetic resources.

• Journal of Life Science
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• v.21 no.3
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• pp.385-392
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• 2011

The otter (Lutra lutra) in Korea is classified as a first grade endangered species and is managed under state control. We performed a phylogenetic analysis of the otter that inhabits the Changnyeong, Jinju, and Geoje areas in Gyeongsangnamdo, Korea using mtDNA and microsatellite (MS) markers. As a result of the analysis using the 676-bp D-loop sequence of mtDNA, six haplotypes were estimated from five single nucleotide polymorphisms. The genetic distance between the Jinju and Geoje areas was greater than distances within the areas, and the distance between Jinju and Geoje was especially clear. From the phylogenetic tree estimated using the Bayesian Markov chain Monte Carlo analysis by the MrBays program, two subgroups, one containing samples from Jinju and the other containing samples from the Changnyeong and Geoje areas were clearly identified. The result of a parsimonious median-joining network analysis also showed two clear subgroups, supporting the result of the phylogenetic analysis. On the other hand, in the consensus tree estimated using the genetic distances estimated from the genotypes of 13 MS markers, there were clear two subgroups, one containing samples from the Jinju, Geoje and Changnyeong areas and the other containing samples from only the Jinju area. The samples were not identically classified into each subgroup defined by mtDNA and MS markers. It could be inferred that the differential classification of samples by the two different marker systems was because of the different characteristics of the marker systems used, that is, the mtDNA was for detecting maternal lineage and the MS markers were for estimating autosomal genetic distances. Nonetheless, the results from the two marker systems showed that there has been a progressive genetic fixation according to the habitats of the otters. Further analyses using not only newly developed MS markers that will possess more analytical power but also the whole mtDNA are needed. Expansion of the phylogenetic analysis using otter samples collected from the major habitats in Korea should be helpful in scientifically and efficiently maintaining and preserving them.

• Journal of Korean Society of Forest Science
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• v.82 no.2
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• pp.166-175
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• 1993

The genetic variation patterns at 23 loci coding for 16 isozymes in eight natural populations of Pinus densiflora for. erects distributed in Kangwon-Kyungbuk region and 17 populations of Pinus densiflora and 13 populations of Pinus thunbergii were compared. The absence of marker alleles specific to P. thunbergii and almost the same allele-frequency distributions to those of P. densiflora did not support the hypothesis that P. densiflora for. erecta is a introgressive hybrid between P. densiflora and P. thunbergii. From the results of the hierarchial analysis of population differentiation using Wright's F statistics(1978), the frequency distributions of single-locus distance coefficients and other genetic analysis (genetic distance, cluster analysis, factor analysis, resin duct analysis), it was concluded that Pinus densiflora for. erecta cannot be treated genetically as a distinct group from other natural populations of P. densiflora.

• Proceedings of the Korean Society of Crop Science Conference
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• 2000.04a
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• pp.124-125
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• 2000

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.10a
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• pp.783-786
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• 2008

외판원문제(Traveling Salesman problem: TSP)는 전형적인 조합최적화 문제로 위치하는 n개의 모든 지점을 오직 한번씩만 방문하는 순회경로를 결정하는 과정에서 순회비용 또는 순회거리를 최소화한다. 따라서 본 논문에서는 종래의 NP-hard문제로 널리 알려진 TSP를 해결하기 위해서 메타 휴리스틱기법 중에서 가장 널리 이용되고 있는 유전 알고리즘(Genetic Algorithm: GA)을 이용한다. 마지막으로, 유전 알고리즘을 이용해 외판원문제에 적합한 성능을 보이는 유전 연산자를 찾아내기 위해 수치 실험을 통해 그 성능에 대한 평가를 한다.

• Korean Journal of Environment and Ecology
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• v.31 no.6
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• pp.492-499
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• 2017

This study analyzed 96 individuals in 6 populations using ISSR marker to investigate the genetic diversity of Salicornia herbacea populations. The total of 49 PCR amplification bands was observed in 6 ISSR primers, and 30 of them had genetic polymorphisms. The Shannon's information index (I) and gene diversity index (h), which indicate the genetic diversity of the Salicornia herbacea populations, were 0.382 and 0.249, respectively. The genetic diversity according to the population size was lowest with 0.092 (I) and 0.058 (h) in $0.1m{\times}0.1m$ and highest with 0.338 (I) and 0.227 (h) in $25m{\times}25m$, which was suitable for the furtherance of the high population with high genetic diversity. The UPGMA dendrogram based on Nei's genetic distance did not show a significant correlation with the distance between the Salicornia herbacea population. The results indicate that the Salicornia herbacea habiting in the restricted environment should have an area over a certain size to ensure the formation of a population with genetic diversity.

• Korean Journal of Plant Resources
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• v.26 no.4
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• pp.491-502
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• 2013

Persimmon (Diospyros kaki Thunb) fruit is one of the most important fruit and have been cultivated from ancient times in Korea. In this study, we found 16 EST-SSR markers that contained one or more EST-SSR sites from 246 cDNA sequences. The developing of EST-SSR marker analysis from 42 persimmon cultivars was compared by genetic relationships and morphological relationships using 6 qualitative traits (fruit related 6 traits) and 19 quantitative traits (flower related 19 traits). In this study, 25 primer sets were tested to identify PCR polymorphism and 14 potential EST-SSR primer pairs were selected. The result of morphological relationship EST-SSR marker analysis showed that the coefficient 0.02 was difficult to categorize in several groups. And then, coefficient 0.77 of genetic relationship showed that the group was classified as four groups. The result of correlation distance between genetic relationship and morphological relationship were investigated was low significance (-0.03). Our results also provided an optimized method for improvement of breeding efficiency and introduce of superior character at persimmon cultivars using EST-SSR markers which was useful for further investigation.