Definition of extrachromosomal element in English:
extrachromosomal element
nounˌɛkstrəˌkrəʊməˈsəʊm(ə)l ˌɛləm(ə)nt
Genetics
The DNA of a cytoplasmic organelle, such as a mitochondrion or chloroplast, responsible for cytoplasmic inheritance.
〔遗传〕染色体外（遗传）因子
Example sentencesExamples
If, on the other hand, excision occurs by 1-bp staggered cuts, we expect that only the first nucleotide flanking the extrachromosomal element will correspond to the donor site.
The transgene array in PD3815 is inherited as an extrachromosomal element.
If resident extrachromosomal elements are responsible for the amplification effect, then that effect should be eliminated if donor strains are previously cured.
The difficulty of removing the amplified gene by repeated backcrossings may suggest the presence of an extrachromosomal element, as often observed in other protozoa.
The latter two are extrachromosomal elements of sizes 35 and 6kb, respectively.