How can dominant-recessive relationships influence which trait is expressed in the phenotype of the organism?

The presence of a dominant-recessive relationship among a pair of alleles can be demonstrated by the probabilities of different traits in offspring. For example, consider a purple-color allele, P, in a plant crossed with a plant having white flower color, W. The resulting offspring can have any of three possible allele combinations: PP, PW, and WW.

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