This determines how a particular trait will be expressed. A dominant allele requires only one copy for its trait to be expressed, while a recessive allele requires two.

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But if you have one allele for blue eyes and another for brown eyes, your eye color will be dictated by whichever allele is dominant. A dominant allele is one that always determines the phenotype when ...

As the Army parade festivities begin in the District, hundreds of demonstrators nationwide are crowding into streets Saturday to rally against Donald Trump.

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