In Gregor Mendel's pea plant experiment, he cross pollinated smooth yellow pea plants and wrinkly green pea plants. This is the parental generation (P). They are all alike because they are all purebred. When they cross pollinated however, they created the first generation (f1). They all ended up being like one parent plant than the other, all yellow and smooth. This is because they are heterozygous and the yellow and smooth trait were dominant genes whereas the green and wrinkly trait were recessive which made them all yellow and smooth but still carrying the recessive genes.
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