Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties?

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The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because one allele was dominant. This means that the dominant allele was expressed over the recessive allele, leading to the visible expression of only one of the two possible phenotypes.

Why Did the F1 Offspring of Mendel's Classic Pea Cross