In Gregor Mendel and his pea plant the P1 stands for parent generation, F1 stands for first filial (daughter) generation, and F2 stands for second filial (daughter) generation. So, for the Parent Cross, or the very first cross-breed Mendel did, which was between tall and short plants, the offspring were all Tt, each having a dominant allele and a recessive. Each F1 plant produces two types of gametes those with allele for tallness and shortness. So basically F1 inhearited P1's tallness, which is dominant, so all F1 plants are tall.
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