True breeding = Always producing offspring
with the same traits as the parents when the parents are self-fertilized.
Mendel started his experiments with true-breeding plant varieties,
which he hybridized (cross-pollinated) in experimental crosses.
· The true-breeding parental plants
of such a cross are called the P generation (parental).
· The hybrid offspring of the P generation
are the F1 generation (first filial).
· Allowing F1 generation
plants to self-pollinate produces the next generation, the F2
generation (second filial).