Extrachromosomal array (Genetics 🧬)
An extrachromosomal array is a method for mosaic analysis in genetics. It is a cosmid, and contains two functioning closely linked genes: a gene of interest and a mosaic marker. Such an array is injected into germ line cells, which already contain mutant alleles of all three genes in their chromosomal DNA. The cosmid, which is not packed correctly during mitosis, is occ...