Complete dominance also means that a dominant allele can mask or cancel out the effect of a recessive allele if an offspring has inherited different alleles from the parents. Inheriting a dominant allele from one parent and a recessive allele from another parent for a trait is the definition of an individual who is heterozygous for a trait. Although the organism in question does not physically display the recessive allele, it can be passed on to offspring and possibly be shown if the other parent also passes on a recessive allele. To know whether the offspring is heterozygous for a trait or not, the test that crosses two children of the same parents can help determine a genotype. If an offspring is found to have two dominant alleles for a trait, they are homozygous dominant for that