F1 generation

mentioned: F2 generation
https://doi.org/10.1351/goldbook.10703
Indicating ‘first filial’ generation, denoting offspring from genotypically (see genotype) distinct parents.
Note: F2 denotes offspring resulting from mating (inbreeding) of individuals from F1. The term may be extended to F3 and beyond.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 753 [Terms] [Paper]