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Definition

noun

(genetics) The first set of parents crossed in which their genotype is the basis for predicting the genotype of their offspring, which in turn, may be crossed (filial generation).

Supplement

The "p" stands for parental. Parental generation is the first generation involving two individuals that are mated to foresee or analyze the genotypes of their offspring.

Variant: parental generation.
Compare: filial generation.