partial diploid

partial diploid

a cell carrying two copies of some, but not all, of its GENES. In BACTERIA where one copy of the genes of interest is carried on the chromosome, a second copy may be introduced on a PLASMID. The cells therefore carry one complete set of genes and a duplicated copy of part of the GENOME. Partial diploids have been constructed in order, for example, to perform the CIS-TRANS TEST.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005