Ó Dochartaigh DNA Project

Compare your DNA with thousands of other samples to identify possible relations. Purchase a DNA test kit, submit a sample (a swab of cells from inside your mouth) then check the database for results. This test measures minor mutations over time.

DNA Genealogy Database Services

Glossary – basic DNA terminology

  •  DNA – deoxyriboneucleic acid…The material inside the nucleus of cells that carries genetic information. Y-DNA determines whether a child will be male or female. It passes from father to son almost unaltered for long periods of time.
  • Chromosome – bundles of tightly coiled DNA
  • Gene – the physical unit of heredity passed from parent to offspring
  • Genome/Genotype – all the genes or genetic information for an individual
  • Locus (plural: loci) – a specific location on the genome
  • Allelle – one of the different forms of a gene that can exist at a single locus
  • Haplotype – linked loci that are inherited as a single unit
  • Haplogroup – branches in the human genetic tree
  • TMRCA – Time to the Most Recent Common Ancestor, expressed in generations 
  • Mutation – minor changes in the gene structure that occur between generations. The degree of mutation is used to estimate the number of generations.                                                  
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