Visual Phasing and Genetic Recombination: A 7-Generation Study
Jerome Spears
Content
About this webinar
This presentation is designed to showcase the immense genetic autosomal DNA discovery properties that can be realized from using (if you are able), advanced VISUAL PHASING methods as part of your family research efforts. As an active “Genetic Explorer” and one of a 5-member full-sibling group, who also has access to (for research and family discovery purposes only), an army of known close and distant cousins - on both paternal and maternal sides of the family), Jerome has been in position “to see” (first hand) how the process of genetic recombination has “placed its finger on the scale” (if you will) - up and down the line - chromosome by chromosome, to have a profound impact on how much (or how little) matching DNA may be captured and observed between any two or more genetically matching individuals. VISUAL PHASING will be explained, GEDmatch chromosome browser terms will be explained, and a specific chromosome #11 example will be demonstrated as part of this webinar.
About the speaker
Key points and insights
In this engaging webinar, speaker Jerome Spears presents a practical approach to visual phasing and genetic recombination, demonstrating how advanced DNA methodologies can breathe life into family history. By utilizing sibling groups and cousin networks across platforms like GEDmatch and MyHeritage, genealogists can trace ancestral DNA lines back through seven generations. The session bridges complex genetic concepts with actionable research strategies, showing researchers how to overcome brick walls and uncover deep lineage using the power of shared genetic inheritance.
- Maximize Sibling and Cousin DNA: Leveraging DNA from a group of siblings and first-to-third cousins creates an essential foundation for visual phasing, allowing researchers to map specific chromosome segments directly back to common grandparents and great-grandparents with high statistical probability.
- Deconflict Through Recombination: Understanding the mechanics of intrachromosomal (crossover) and interchromosomal recombination enables genealogists to determine exactly which grandparent contributed specific DNA segments, isolating inherited traits across generation lines.
- Push Past the "Low-Hanging Fruit": Once foundational cousin tiers are established, visual phasing techniques allow researchers to venture into distant match territory—reaching back as far as seven generations to pre-Civil War ancestors with measurable accuracy.
To fully grasp these visual phasing techniques and see worked step-by-step chromosome browser examples in action, genealogists are strongly encouraged to watch the complete webinar recording. Exploring the comprehensive syllabus included with the presentation will provide additional learning paths, curated tools, and valuable references to elevate your genetic genealogy research to new heights.
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Comments (49)
A complex and fascinating subject, very well presented. Love the enthusiasm! I'm all for collaborating. I'll be watching this one again, especially the second half, to pick up on all the goodness. Thank you!
I loved the talk, and it made sense to me because I already understood the concepts, but the comparison slides between the five siblings and cousin G (for instance) might be easier to follow if the visuals zoomed in on the area being discussed, or used an enlargement “lens” to show more detail while retaining the big picture context — but these are minor considerations!
I really love the way Jerome explained the variation in DNA inherited by siblings on each chromosome from parents and g-parents. This is so misunderstood by many people and I wish everyone could see this presentation as it would motivate them to test siblings! I have only 1 sibling myself (tested!) and, unfortunately, can't put the visual phasing to its full use. But great presentation!
Definitely worth listening to. I was familiar with the concept, but had not yet looked into the details. This course is definitely going to be watched again. Great job Jerome!
This excellent presentation visually helped me understand the two processes of DNA recombination, and how visual phasing can help identify DNA segments from specific ancestors.
WOW, so much information! I will have to watch this again , maybe more than once
An immense amount of information packed into this brief. For sure one to watch a few more times.
i've got to rewatch it several times (mainly NOT due to me being German), as I have to find workarounds for neither having sibs nor 1C on my mums side, but already now am deeply impressed with those possibilities.