There Usually Isn't a Gene for a Specific Feature
Another popular misconception about genetics is that certain behaviors or traits boil down to singular genes and alleles. This is due in part to the structure of early genetic experiments focused on simple organisms (like Gregor Mendel’s famous pea plants) where changes over generations could be easily observed. The simplicity of these experiments made them valuable teaching aids in science education, but geneticists are increasingly discovering the subtle effects of seemingly unrelated genes that combine to determine a result once thought to be down to just one or two chromosomes.
Photo Credit: Flickr user Can H.