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Understanding Cancer Series

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  • Posted: 12/29/2009

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Slide 15

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Genotypes, Phenotypes and Alleles

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All genotypes are not created equal in their influence on phenotype. Genes come in many varieties called alleles, and some are more dominant than others. In a pair of alleles, the effect of a dominant allele prevails over the effect of a recessive allele. And the effects of a recessive allele become apparent only if the dominant allele becomes inactivated or lost.

Graphic shows how all genes are not equal in their ability to influence a cell. Varieties called dominant alleles prevail in creating effects over a counterpart recessive allele.