If two strains of true-breeding plants that have different alleles for a certain character are crossed, their progeny are called A) the P generation. B) the F₁ generation. C) the F₂ generation. D) F₁ crosses. E) F₂ progeny.

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The progeny of two true-breeding plants with different alleles for a character are referred to as the F1 generation, which is a standard terminology in genetics. The "F" stands for filial, and "1" indicates the first generation of offspring from the parental (P) generation.

If Two Strains of True-Breeding Plants That Have Different Alleles