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DNA Day at the FamilySearch Library (view source)
Revision as of 13:31, 26 April 2021
, 26 April 2021→Autosomal DNA (atDNA): added fan charts
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There are currently five DNA testing companies who test both ethnicity and provide match lists: AncestryDNA, FamilyTreeDNA, 23andMe, MyHeritage DNA, and Living DNA. The match lists are essential to using DNA in family history research. A comparison chart is at the right and more information on these companies can be found [https://www.familysearch.org/dna-testing/test-options here]. | There are currently five DNA testing companies who test both ethnicity and provide match lists: AncestryDNA, FamilyTreeDNA, 23andMe, MyHeritage DNA, and Living DNA. The match lists are essential to using DNA in family history research. A comparison chart is at the right and more information on these companies can be found [https://www.familysearch.org/dna-testing/test-options here]. | ||
[[File:DNA testing companies comparison chart.jpg|right|frameless|599x599px|DNA Testing Companies Comparison Chart]] | [[File:DNA testing companies comparison chart.jpg|right|frameless|599x599px|DNA Testing Companies Comparison Chart]] | ||
[[File:AtDNA fan chart.jpg|left|thumb|278x278px|How autosomal DNA is inherited]] | |||
===Autosomal DNA (atDNA)=== | ===Autosomal DNA (atDNA)=== | ||
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*Eliminating one of two possible ancestors | *Eliminating one of two possible ancestors | ||
*Finding up to about 3x great-grandparents | *Finding up to about 3x great-grandparents | ||
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[[File:Fan chart Y-DNA.jpg|left|thumb|283x283px|How Y-DNA is inherited]] | |||
===Y-DNA=== | ===Y-DNA=== | ||
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*An unknown father, grandfather, great-grandfather, etc. | *An unknown father, grandfather, great-grandfather, etc. | ||
*Surname projects | *Surname projects | ||
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[[File:Fan chart mtDNA.jpg|left|thumb|283x283px|How mitochondrial DNA is inherited]] | |||
===Mitochondrial DNA (mtDNA)=== | ===Mitochondrial DNA (mtDNA)=== | ||
Mitochondrial DNA or mtDNA is most useful when used in conjunction with atDNA on the maternal line. | Mitochondrial DNA or mtDNA is most useful when used in conjunction with atDNA on the maternal line. | ||
==''Grouping DNA Matches''== | ==''Grouping DNA Matches''== | ||
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As you review the trees of your matches, you may run into a variety of different kinds of trees, including: | As you review the trees of your matches, you may run into a variety of different kinds of trees, including: | ||
* If a match has a '''Full Tree''', review their tree and determine the common ancestor. If you cannot find a common ancestor, it is possible there is a non-paternal event (NPE) or misattributed parental event (MPE) either in your line or in the ancestry of your match. Review the shared matches to determine whether the NPE/MPE is in your tree. (Are you getting matches from all of your ancestors?) If you determine the event happened in the tree of your ancestor, wait for them to reach out to you. | *If a match has a '''Full Tree''', review their tree and determine the common ancestor. If you cannot find a common ancestor, it is possible there is a non-paternal event (NPE) or misattributed parental event (MPE) either in your line or in the ancestry of your match. Review the shared matches to determine whether the NPE/MPE is in your tree. (Are you getting matches from all of your ancestors?) If you determine the event happened in the tree of your ancestor, wait for them to reach out to you. | ||
* If a match has a '''Small Tree''' with at least one name and date for one ancestor, see if you can fill in the their tree either by searching other trees or build their tree for them. | *If a match has a '''Small Tree''' with at least one name and date for one ancestor, see if you can fill in the their tree either by searching other trees or build their tree for them. | ||
* If a match has not yet '''linked''' their DNA results to their '''tree''', review all of their unlinked trees and see if you can figure out the relationship. Be careful, if the DNA kit is managed by someone else, the unlinked trees may belong to the kit owner, not the test taker. | *If a match has not yet '''linked''' their DNA results to their '''tree''', review all of their unlinked trees and see if you can figure out the relationship. Be careful, if the DNA kit is managed by someone else, the unlinked trees may belong to the kit owner, not the test taker. | ||
* If a match '''does not''' have a '''tree''' or has a '''private''' '''tree''', use clusters to determine which line they belong to. If they are part of the line you are researching, contact them. However, keep your communication short and to the point. Remember that many people take DNA tests to see their ethnicity results but are unlikely to reply. | *If a match '''does not''' have a '''tree''' or has a '''private''' '''tree''', use clusters to determine which line they belong to. If they are part of the line you are researching, contact them. However, keep your communication short and to the point. Remember that many people take DNA tests to see their ethnicity results but are unlikely to reply. | ||
When working with unknown clusters, your goal is to 1) identify an ancestor common to several members of the cluster, 2) identify descendants of that common ancestor or common ancestral couple, and 3) look for common names and locations with known information. | When working with unknown clusters, your goal is to 1) identify an ancestor common to several members of the cluster, 2) identify descendants of that common ancestor or common ancestral couple, and 3) look for common names and locations with known information. | ||