Write an explanation of dominant and recessive alelles appropriate for a jr high class

Dominant and Recessive Alleles. In a heterozygous individual, the effect of one allele for a gene may "covered up" the effect of the other allele, The "covered up" allele does not show up in the individual's phenotype. An allele that "covers up" another allele this way is the dominant allele of that allele pair. The allele that is "hidden" is the recessive allele. The phrase "dominant and recessive genes" is often used to mean "dominant and recessive alleles". - from website genics def.