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Mendel’s principle of dominance suggests a gene will always be masked by the presence of a gene.

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In Mendel’s dominance principle, a recessive gene will always be hidden by a recessive gene. In Mendelian genetics the characteristics of each organism are controlled by two alleles (forms of one gene). When both alleles are dominant the organism will display the dominant trait. When one allele is dominant and the other recessive, the organism will still display the dominant trait. When the organism has two recessive alleles, you will only see the recessive trait. The reason is that the organism has two alleles, one coming from the mother of the organism and the other from the father.