What is a trait that appers only if an an organism has two factors the traits?

A trait that appears only when an organism has two factors for that trait is known as a recessive trait. In genetics, traits are determined by alleles, which can be dominant or recessive. A recessive trait is expressed phenotypically only when an individual has two recessive alleles (homozygous) for that trait, meaning both copies of the gene must carry the recessive variant. If an organism has at least one dominant allele, the dominant trait will manifest instead.