In biology and evolutionary computation, a<unk> (plural loci) is a fixed position on a chromosome, such as the position of a gene or a biomarker (genetic marker).  A variant of the DNA sequence at a given<unk>  is called an allele.  The ordered list of loci known for a particular genome is called a genetic map. Gene mapping is the process of determining the<unk> for a particular biological trait.
Diploid and polyploid cells whose chromosomes have the same allele at some<unk> are called homozygous, while those that have different alleles at a<unk>  heterozygous.
Locus 
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Serotype
Open reading frame
Idose
Molecular biology
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Trait 