DNA for Genealogists (Intro) - Rcasey.net

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How do Y-SNPs workOnly found on Y chromosomeMost are one time mutationsDiscovers branches from 500 to 50,000 yearsUnlike Y-STRs, have a very hierarchical relationships(father / son relationships)Create true genealogical like descendant treeOnce you find your most recent Y-SNP (usually 500to 2,000 years old) Y-STRs complement Y-SNPs formore recent mutationsRecent explosion from 2,000 to 10,000 Y-SNPs, manymore to be discovered in the futureAugust, 2012 12
How Autosomal tests worksCovers all ancestral lines – but limited to post-1850Comes from most chromosomes but not Y-DNARecombines 50 % from each parent every generationEach recombination results in long segments ofcommon DNA that is partially passed to childrenSegments get shorter and shorter every generationuntil no longer reliable for identification purposesMultiple tests of close relatives required to sort outwhich segments belong to which lineThe total amount of longer segments can estimatethe degree of relationship (3 rd cousin, once removed)August, 2012 13
Page 2 and 3: Intro to DNA for GenealogistsType o
Page 5 and 6: How Autosomal worksCovers all ances
Page 7 and 8: GEDMATCH Database - atDNAAttempts t
Page 9 and 10: How Y-SNPs workDefines genetic bran
Page 11: How do Y-STRs workOnly found on Y-D
Page 15 and 16: Books to get up to speed withTrace
Page 17 and 18: Cost of Testing (Retail - FTDNA onl
Page 19 and 20: Future trendsY-SNP tests will becom
Page 21 and 22: War stories - atDNA for CaseyCommon
Page 23 and 24: War stories - YDNA provides answers
Page 25 and 26: War stories - YDNA provides answers
Page 27 and 28: Questions & AnswersIt takes a while
Page 29 and 30: This issue is rarely covered by boo
Page 31 and 32: August, 2012 31
Page 33 and 34: Y-SNP analysis is the futureEvery s

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