Flexi Says: Mendel noted that hybridizing true-breeding (P generation) plants gave rise to an F1 generation that showed only one trait of a characteristic. For example, a true-breeding purple-flowering plant crossed with a true-breeding white-flowering plant always gave rise to purple-flowered hybrid plants. There were no white-flowered hybrids. This is because the cross of true breed purple and white-flowering plants (PP x pp) produce heterozygous purple-flowering (Pp) offspring where purple is dominating over white.
