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Schematic using inbred progenitor strains in a two-generation cross to produce a panel of F2 progeny. P1 and P2 are progenitor/parental strains that differ in a particular trait of response. The F1 progeny (1st generation) are all genetically identical, having inherited half their genome from P1 and half their genome from P2. The F2 progeny (2nd generation) are composed of genetically unique individuals.
