text: 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.
option_0: Locus 
option_1: Subscript
option_2: Serotype
option_3: Open reading frame
option_4: Idose
option_5: Molecular biology
option_6: Superscript
option_7: Trait 