When Mendel first transferred pollen from a yellow pea plant to a green pea plant he observed that all of the first generation of plants bore yellow peas.

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This is known as the Law of Dominance, which states that when two purebred individuals (one with dominant and one with recessive alleles) are crossed, the dominant trait will always be expressed in the offspring of the first generation. In this case, yellow peas are dominant over green peas.

When Mendel First Transferred Pollen from a Yellow Pea Plant