{{short description|Combination of alleles in more than one place}} A '''multilocus genotype''' is the combination of alleles found at two or more loci in a single individual.
For example, in a diploid species, if there are two SNP loci and the first locus has alleles A and G, while the second locus has alleles T and C, the multilocus genotype can be represented as {A/G,T/C}. If the genome is not haploid then the multilocus genotype does not necessarily determine which alleles co-occur on chromosomes. In the example, if the two loci are located on the same chromosome the possibilities are either {A-T,G-C} or {A-C,G-T}. Where A-T represents a haplotype with alleles A and T together on one chromosome and G and C together on the other. If the haplotypes are determined the multilocus genotype is referred to as a phased genotype, otherwise it is referred to as unphased. Some authors<ref>{{cite book|jstor=4153187 |last=Thompson|first=Elizabeth A. |title=Statistical Inference from Genetic Data on Pedigrees |series=NSF-CBMS Regional Conference Series in Probability and Statistics |year=2000|volume=6 |publisher=Institute of Mathematical Statistics |doi=10.1214/cbms/1462106037 |isbn=0-94-0600-49-8 }}</ref><ref>{{Cite book|title=Mathematical and Statistical Methods for Genetic Analysis|last=Lange|first=Kenneth|publisher=Springer-Verlag|year=2003|isbn=0-387-95389-2|location=New York|pages=4}}</ref> suggest that the term multilocus genotype should only be applied to phased multilocus data while others<ref>{{Cite journal|last1=Pritchard |first1=Jonathan K.|last2=Stephens | first2=Matthew | last3=Donnelly | first3=Peter |date=2000|title=Inference of population structure using multilocus genotype data.|journal=Genetics|volume=155|issue=2 |pages=945–959|doi=10.1093/genetics/155.2.945 |pmid=10835412|pmc=1461096 }}</ref> apply it to unphased multilocus data as well. The combination of alleles at two or more loci on a single chromosome make up a haplotype and the two haplotypes in a diploid individual make up the diplotype (a synonym for a phased multilocus genotype).
== References == {{reflist}}
Category:Classical genetics Category:Genetic genealogy