翻訳と辞書 Words near each other ・ Balanced polygamma function ・ Balanced prime ・ Balanced repeated replication ・ Balanced Rock ・ Balanced rudder ・ Balanced salt solution ・ Balanced scorecard ・ Balanced sentence ・ Balanced set ・ Balanced ternary ・ Balanced trade ・ Balanced Worlds ・ Balanced-arm lamp ・ Balanced-growth equilibrium ・ Balancer ・ Balancer chromosome ・ Balances Mechanics ・ Balanchine (crater) ・ Balanchine (horse) ・ Balanchine method ・ Balanchine Stakes ・ Balanchivadze ・ Balancing (bridge) ・ Balancing (international relations) ・ Balancing Act ・ Balancing Acts ・ Balancing and deranking ・ Balancing domain decomposition method ・ Balancing lake ・ Balancing machine Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Balancer chromosome ： ウィキペディア英語版 Balancer chromosome Balancer chromosomes are special, modified chromosomes used for genetically screening a population of organisms to select for heterozygotes. Balancer chromosomes can be used as a genetic tool to prevent crossing over (genetic recombination) between homologous chromosomes during meiosis. Balancers are most often used in ''Drosophila melanogaster'' (fruit fly) genetics to allow populations of flies carrying heterozygous mutations to be maintained without constantly screening for the mutations but can also be used in mice. Balancer chromosomes have three important properties: they suppress recombination with their homologs, carry dominant markers, and negatively affect reproductive fitness when carried homozygously. == History of balancer chromosomes == Balancer chromosomes were used as far back as 1975 in the paper (Analysis of Chromosome 4 in Drosophila Melanogaster11: Ethyl Methanesulfonate Induced Lethals ). Random mutations are caused by feeding the larva ethyl methane sulphonate. When a phenotype of interest is observed, the line is crossed with another line containing balancer chromosomes to maintain their lineage. In one instance they were used to genetically screen a population of ''Caenorhabditis elegans''. At this point in time scientists had already realized the benefits of being able to genetically screen populations of organisms for genetic study. Equally as important, they also realized that they could limit crossing over in these populations as well give them a very consistent genetic population.〔 〕 The use of balancer chromosomes has evolved into a well known and widely used method for genetic screening of model organisms. They are even being used to investigate the role of heterochromatin packing and the effect it has on genes as well as studies on the effect telomeres have on gene silencing. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Balancer chromosome」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.