A Response area allele will be expressed whenever it is present in the genotype.

This means that if a Response area allele is present in an individual's genetic makeup, it will be expressed or shown in the individual's physical traits or characteristics. This is because the presence of the allele codes for a specific trait or characteristic, and is therefore expressed in the phenotype of the individual. It is important to note that the expression of alleles can be influenced by other factors, such as the presence of other alleles or environmental factors.