A locus is a section of DNA sequence and can be a SNP, a gene or a larger region of DNAsequence.
See Chromosome.

References
Other terms in 'Useful genetic terms ':
- Allele
- Chromosome
- Copy number variation (CNV)
- Deoxyribonucleic acid (DNA)
- Gene
- Genetic variant
- Genotype
- Haplotype
- Heterozygous/heterozygote
- Homozygous/homozygote
- Linkage disequilibrium (LD)
- Palindromic SNP
- Polygenic risk score (PRS)
- Polymorphism
- Rare variants
- Single nucleotide polymorphism (SNP)