What makes a gene dominant or recessive It is not the gene but the allele of that gene that is dominant or recessive. In addition, we do not contain two copies of each gene. Some genes exist at zero or one copy and others are somewhat to greatly duplicated - and this is considered normal (copy number) variation.
Can a human smell through the ears? @terdon I wrote that expression of a olfactory receptor means there is the potential for that function and not an absolute, defined function.
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