英和和英

出典:『Wikipedia』 (2011/05/07 15:45 UTC 版)

英語による解説

引用

Homoplasmy is the presence of a mutation affecting all of the mitochondrial DNA (mtDNA) copies in a mammalian cell or chloroplast DNA in a plant cell. Since there are hundreds or even thousands of mtDNA copies in every eukaryotic cell, mutations may either be present in all copies (homoplasmy) or affect only a fraction of them (heteroplasmy). Homoplasmy may also refer to the presence of mutation, or insertion of a foreign gene, into all of the plant plastid organelles DNA (e.g. all chloroplasts). Homoplasy, more generally, is the state whereby all non-nuclear genomes are the same, whether wild type or mutated.