Answer:
Step-by-step explanation:
Mendel described the purple pea flower color allele as a dominant allele. This means that if a pea plant has at least one copy of the purple pea flower color allele, its flowers will be purple. The recessive allele for pea flower color is white, so if a pea plant has two copies of the white pea flower color allele, its flowers will be white.
Mendel discovered this through his experiments with cross-breeding pea plants. He crossed pea plants with purple flowers with pea plants with white flowers. The resulting offspring, called the F1 generation, all had purple flowers. This showed that the purple pea flower color allele is dominant.
Mendel then self-crossed the F1 generation. The offspring of this cross, called the F2 generation, had a 3:1 ratio of purple to white flowers. This showed that the white pea flower color allele is recessive.