Author Profile

Bradley T Larkin

City: Galveston

State: Texas

Country: United States

Brad is a native Texan who earned a Masters degree in Business Administration from Rice University, a Bachelor's degree in Aerospace Engineering from UCLA and is also a Microsoft Certified Systems Engineer (MCSE). Surname DNA offers Brad the chance to combine his technology background with his passion for genetic genealogy.

Recent Posts

Autosomal DNA for Beginners – 2024 Update

Computer-generated image of DNA double helix with Questions by Donna Rutherford using DALL-E.

World renowned genetic genealogist Donna Rutherford has updated her DNA FAQ with the latest information for beginners at this time. It’s a great distillation covering lots of companies and web sites. So if you’re new to autosomal DNA and want to learn more, we highly recommend giving it a read. DNA – What, when, how, […]

Intermediate and Advanced Y-DNA Topics

Oct 2022 Beyond STRs

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FeatureImage Advanced Y-DNA

Deep dive into Y-DNA NextGen SNP genetic genealogy tests like Big Y-700 and YSeq WGS
From Biology to Data to the Phylogenetic Tree to Geographic Interpretation

– Explanation of raw read alignment to the genome which produces your SNP results
– Understanding your terminal SNP and why it changes
– How to use Novel Variants / Unnamed Variants to extend the phylogenetic tree for your family
– Tips on getting the most info and avoiding bugs in current tools using real world examples

Intermediate and Advanced Y-DNA Topics – Oct 2022

The slides from a presentation by Brad Larkin in October 2022 on Intermediate and Advanced Y-DNA Topics for genetic genealogy have been posted here on SurnameDNA Journal. https://www.surnamedna.com/?attachment_id=2432 This session’s goal was to offer a deeper understanding of Y-DNA NextGen SNP genetic genealogy tests like Big Y-700 and YSeq WGS. The approach was to go […]

Resources for Intermediate and Advanced Y-DNA Topics – SCGS 2022

Southern California Genealogical Society Jamboree Genetic Genealogy 2022 Online Virtual Conference LIVE: FRIDAY & SATURDAY AUGUST 19-20, 2022 World-class DNA Conference Get in on the Latest Discoveries Learn from over 20 renowned Genetic Genealogy experts All purchased Genealogy Jamboree presentations viewable through October 31, 2022. See conference Web Site for registration and viewing information Overview […]

Irish Mapping DNA Project – March 2020 Update

Mapping of Y-DNA Groups

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Feature article on Irish DNA Mapping

Publication of maps of earliest known paternal ancestor within Ireland for over 200 samples with known geographic origin in Ireland based on data as of 22 March 2020. Groups plotted include R-M222, R-Z39589, R-Z253, R-U106, R1a, I1, and I2.

Irish Mapping DNA Project – March 2020 Update

Feature article on Irish DNA Mapping

A summary and update on the Irish Mapping DNA Project has been completed. Within the Project, Y-DNA results are grouped based on the Y SNP Phylogenetic Tree branches deemed important in the Irish context. Assignment to these groups is limited to those who have taken SNP-based Y DNA tests. STR-only results are not assigned to […]

DNA, Clans, and Monarchy

A presentation on the DNA, Clans, and Monarchy of Ireland was given in Belfast, Northern Ireland in 2018. This material updates earlier presentations on DNA vs Irish Annals and The Y DNA of the British Monarchy. See the DNA, Clans and Monarchy Presentation Slides Updates include: Modern genetic genealogy DNA findings in the context of […]

Resources for Why the Big Y DNA Test?

“Which DNA test should I get?” is a common question posed to genealogists. This session will explain the three major types of DNA tests with a focus on Y-DNA. Costs and benefits of the various Y-DNA test options will be weighed. Most importantly, the Big Y-700 DNA test will be examined in terms of costs, […]

Resources for DNA and Digitization in Irish Genealogy 2019

The online tools for making new genealogy discoveries about your ancestors from Ireland have increased radically in the past five years thanks to DNA sampling of modern Irish residents and digitization of surviving paper records. This presentation will provide an orientation on how you can use these new resources to make breakthroughs in researching your […]

Y-DNA SNP Database Characterization

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Vertical bar chart showing the five most densely sampled countries for Y-DNA: Ireland, Finland, UK, Norway, and Sweden.

Analysis of sample count and sampling density of the Y-DNA SNP results in the Family Tree DNA results database. Comparison of World, European, and British Isles figures by country, Y haplotype, and phylogenetic tree branch count.