back-crossing

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I obtained 5 nuts in 1947, by back-crossing the hybrid to Persian walnut.

Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting Guelph, Ontario, September 3, 4, 5, 1947
It involves crossing and back-crossing parents to produce something called parthenocarpy.

post-gazette.com - News 2009
Cobey initially developed the New World Carnolians stock, a dark race of honey bees, in the early 1980s by back-crossing stocks collected from throughout the United States to create a more pure strain.

Western Farm Press RSS Feed 2008
600 American chestnut seeds that have been cross-pollinated with Chinese chestnut to produce blight-resistant trees will be planted (click here for more information on the back-crossing program).

Penn State Live 2010