Question

An allele whose trait always shows up in the organism when the allele is present.

Answer 1

An allele that always shows up in an organism when it is present is referred to as a **dominant allele**. In genetics, dominant alleles are expressed in the phenotype (the observable traits) of the organism, even if only one copy is present (heterozygous condition). In contrast, a **recessive allele** only shows its trait when two copies are present (homozygous condition).