Final answer:
The first cross where Mendel obtained purple pea plants by crossing purple and white pea plants is called the F1 cross.
Explanation:
The first cross where Mendel crossed purple pea plants with white pea plants and obtained purple pea plants is known as the F1 cross. In this cross, the parental generation (P generation) consisted of purple and white pea plants, while the first filial generation (F1 generation) resulted in all purple pea plants.
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