In English | En español
Questions About Cancer? 1-800-4-CANCER

Understanding Cancer Series

< Back to Main
  • Posted: 12/29/2009

Page Options

  • Print This Page
  • Print This Document
  • View Entire Document
  • Email This Document
  • View/Print PDF
  • View/Print PowerPoint

Slide 15


Genotypes, Phenotypes and Alleles

< Previous SectionNext Section >

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.