Since you are diploid, you have two copies of the locus, one inherited from your father and the other from your mother. Regarding the iris example, there exists an allele of the locus called EYC元 which causes the eye to be some shade of brown from lots of eumelanins, and another that causes few eumelanin to be produced, resulting in an iris that is blue, gray or green. Most loci can eventually be assigned to specific genes, but there is no straightforward 1:1 relationship between loci and genes, and whereas a gene always encodes for a protein, a locus might be in a noncoding DNA sequence.Īn allele (or allelic variant) is any of the versions of some genetic locus that might exist in a population. A locus is similar, but more loosely defined: since phenes are usually readily apparent but determining which genes contribute to them is a complicated process, loci are simply locations in the genome which are known to be directly related to expression of defined phenes. In general terms, a gene contributes to production or expression of some trait or character (a phene), e.g.
In genetics, a dominance relationship refers to how the alleles for a locus interact to produce a phenotype. For other non-genetic uses of the term "dominance", see Dominance.
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