DNA Testing, Genetic Genealogy

Understanding Relationships (Part Two) – how much DNA do we share?

Being able to identify possible relationships by examining how much DNA is shared between two people is a key part of genetic genealogy.

Today’s information sheet looks at the categories used by the testing companies and how to move beyond these headings to find the correct relationship between you and your matches.

It provides an non-technical overview of

  • how DNA is measured
  • how it passes from one generation to the next,
  • why you might not share any DNA with people who are your relatives (and why your sibling/cousin matches someone you don’t)
  • how much DNA you can expect to share for a variety of different relationships.

Links to online charts/calculators are provided, helping you get a headstart on working with your own matches when your DNA results arrive.

Understanding Relationships (Part Two) – How much DNA do we share?

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