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Foundation Year 1 (FY1)
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
F1the first generation of filial offspring of a particular cross. The number can be changed to indicate the generation, for example, F3 would be the great-grandchildren of a particular pair of individuals.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005