from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative form of back cross.
from The Century Dictionary and Cyclopedia
- To cross or interbreed between a Mendelian hybrid and one of the pure parental forms.
Sorry, no etymologies found.
And if you wanted to make this the ideal experiment you'd probably back-cross separately onto multiple different wild strains, and assay markers at the boundary of the deletions to make sure that the final strain is carrying the deletion, and nothing else.
In conceptual-genetics terms, that would make the new Time an inbred back-cross.