For the traits Mendel studied one allele is completely dominant and the other is completely recessive.

Question

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This is true for the traits that Mendel studied: one allele was dominant and the other was recessive. This means that the dominant allele would always be expressed in the phenotype, even if the individual was heterozygous (having one copy of each allele). The recessive allele would only be expressed if an individual had two copies of it (i.e. was homozygous recessive).

For the Traits Mendel Studied One Allele Is Completely Dominant