A dominant gene is an inherited gene that is decisive for the last expressed trait.
There are many alleles on the chromosomes, and a pair of alleles may have a dominant/recessive relationship. Those that control dominant traits become dominant genes, while recessives are genes that, even though they are present, do not necessarily express the corresponding traits. Dominant genes can inhibit the role of recessive genes, and there are two types of inhibition: complete inhibition and incomplete inhibition.
In human beings, some common traits are dominant, such as height, skin color, double or single eyelids, and length, etc. Recessive are some uncommon ones, such as red-green color blindness and nearsightedness.