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Review What does incomplete dominance mean and give an example Design an Experiment Design an experiment to determine whether the pink flowers of petunia plants result from incomplete dominance Compare and Contrast What is the difference between incomplete dominance and codominance CH 11 INTRODUCTION TO GENETICS 11.3 Other Patterns of Inheritance In most organisms, genetics is more complicated, because the majority of genes have more than two alleles Many important traits are controlled by more than one gene. Incomplete Dominance Heterozygous phenotype is a blending or mixing of the homozygous phenotypes. Codominance Both alleles are visible Speckled fur/feathers. Multiple Alleles Gene with more than two alleles. Polygenic Traits Traits controlled by two or more genes Wide range of phenotypes Skin color. Genes and the Environment Genes provide a plan for development Environment plays a role in how the plan unfolds. Western White Butterfly Spring hatches have more wing pigments than summer hatches To fly the body temperature needs to be 28–40°C.