Some organisms have traits whose alleles show , which means that neither allele for a particular trait is over the other. When you complete a Punnett Square for incomplete dominance, you do not use lowercase letters since neither allele is recessive to the other one. Instead, a is used for one allele, and the same capital letter with an apostrophe or tic mark after it represents the other allele. Example: Snapdragons are plants that show incomplete dominance in their flower color. If snapdragons with red flowers are crossed with snapdragons with white flowers, the phenotype of the offspring is between the two colors. They will have, just like mixing red paint with white paint to get pink paint.