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Percentage of Shared Autosomal DNA http://debbiewayne.com/ Attribution-NonCommercial-ShareAlike, CC BY-NC-SA — Debbie Parker Wayne, CG, CGL

Parent Great 2nd Great 3rd Great 4th Great 5th Great 6th Great 7th Great YOU 50% Half- Grandparent Grandparent Grandparent Grandparent Grandparent Grandparent Grandparent 25% Half-/ uncle 6.25% 3.13% 1.56% .78% .39% .20% Focus Person Half-niece/ nephew 12.5% Sibling Aunt/uncle Great 2nd Great 3rd Great 4th Great 5th Great 6th Great 7th Great 50% 50% Niece/nephew aunt/uncle aunt/uncle aunt/uncle aunt/uncle aunt/uncle aunt/uncle aunt/uncle 25% 12.5% 6.25% 3.13% 1.56% .78% .40% .20% Grandparent Aunt/uncle 1st 1st cousin once 1st cousin 2x 1st cousin 3x 1st cousin 4x 1st cousin 5x 1st cousin 6x 1st cousin 7x Half-sibling Niece/nephew 12.5% removed removed removed removed removed removed removed 25% 25% 6.25% 3.13% 1.56% .78% .40% .20% .10% Great Grandparent Great 1st cousin once 2nd cousin 2nd cousin 2nd cousin 2x 2nd cousin 3x 2nd cousin 4x 2nd cousin 5x 2nd cousin 6x Half-aunt/ uncle aunt/uncle removed 3.13% once removed removed removed removed removed Half-niece/ nephew 12.5% 6.25% removed .78% .40% .20% .10% .05% 12.5% 1.56% 2nd Great 2nd Great 1st cousin 2x 2nd cousin once 3rd cousin 3rd cousin 3rd cousin 2x 3rd cousin 3x 3rd cousin 4x 3rd cousin 5x Grandparent aunt/uncle removed removed .78% once removed removed removed removed 6.25% 6.25% 3.13% 1.56% removed .20% .10% .05% .025% .40% 3rd Great 3rd Great 1st cousin 3x 2nd cousin 2x 3rd cousin 4th cousin 4th cousin 4th cousin 2x 4th cousin 3x 4th cousin 4x Grandparent aunt/uncle removed removed once .20% once removed removed removed 3.13% 3.13% 1.56% .78% removed removed .05% .025% .013% .40% .10% 4th Great 4th Great 1st cousin 4x 2nd cousin 3x 3rd cousin 2x 4th cousin 5th cousin 5th cousin 5th cousin 2x 5th cousin 3x Grandparent aunt/uncle removed removed removed once .05% once removed removed 1.56% 1.56% .78% .40% .20% removed removed .013% .006% .10% .025% 5th Great 5th Great 1st cousin 5x 2nd cousin 4x 3rd cousin 3x 4th cousin 2x 5th cousin 6th cousin 6th cousin 6th cousin 2x Grandparent aunt/uncle removed removed removed removed once .013% once removed removed .78% .78% .40% .20% .10% .05% removed .006% .003% .025% 6th Great 6th Great 1st cousin 6x 2nd cousin 5x 3rd cousin 4x 4th cousin 3x 5th cousin 2x 6th cousin 7th cousin 7th cousin once Grandparent aunt/uncle removed removed removed removed removed once removed .003% removed .39% .40% .20% .10% .05% .025% .013% .006% .0015% 7th Great 7th Great 1st cousin 7x 2nd cousin 6x 3rd cousin 5x 4th cousin 4x 5th cousin 3x 6th cousin 2x 7th cousin 8th cousin Grandparent aunt/uncle removed removed removed removed removed removed once removed .001% .20% .20% .10% .05% .025% .013% .006% .003% .0015% Double- and others with multiple biological relationships will likely share more than the percentage of DNA shown in this chart. For more information see http://www.isogg.org/wiki/Autosomal_DNA_statistics#DNA_percentages.

Shared percentages are taken from many biology textbooks and with some fields completed by Debbie Parker Wayne based on calculations from the given percentages in those reference books as well as, “What is the average percent DNA share for different types of cousins,” 23andMe Customer Care, posted 10 April 2012 (https://customercare.23andme.com/entries/21231991-what-is-the-average-percent-dna-shared-for-different-types-of-cousins : accessed 31 October 2012) and “What percentage of our common ’ DNA do I share with my cousin?,” Tree DNA FAQ ID #624 (http://www.familytreedna.com/faq/answers.aspx?id=17#624 : accessed 31 October 2012).