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Chromosome Mapping

Segment data: what’s going on?

In early October 2023, it emerged that a bad actor had used stolen passwords to gain unauthorized access to 23andMe accounts. This has had some knock-on effects, and the situation with segment data has changed: Luckily we can still get segment data from everywhere except 23andMe (and AncestryDNA, where it was never available in the

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Chromosome Mapping Did you know? Tips

Different views in your chromosome map: did you know? #5

The fifth post in a series aiming to surface features at DNA Painter that you might not be aware of. This time I’m focusing on different views within your chromosome map.

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Chromosome Mapping Tips

The new Living DNA chromosome browser

Today, the British testing company Living DNA announced that they’ve added a chromosome browser. In this post I’ll explain what the new feature does and give my first impressions of this first release. I’ll also explain how you can use this data in your DNA Painter chromosome map.

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Chromosome Mapping Guest posts Inferred Chromosome Mapping Tips

Reconstructing Grammy’s DNA

For my latest guest post, I’m pleased to welcome Tanner Tolman, a professional genealogist based in Utah. Tanner has successfully achieved something that’s a holy grail for many genealogists: reconstructing someone’s DNA based on the DNA of their descendants. Tanner has written a detailed account of the steps he had to go through in the process of DNA reconstruction for his wife’s grandmother.

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Chromosome Mapping Did you know? Tips

Customizing your chromosome map: did you know? #4

The fourth post in a series aiming to surface features at DNA Painter that you might not be aware of. This time I’m focusing on display options for your chromosome map.

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Chromosome Mapping New Features

Finally! A cM slider for chromosome maps

Several years after it was first requested, I have recently released a simple ‘cM slider’ as an option that can be turned on in any chromosome map at DNA Painter.

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Chromosome Mapping New Features

New gridlines and enhanced chromosome view in maps

This article introduces some improvements to chromosome maps at DNA Painter, including options to turn on megabase gridlines, improved keyline labelling and a redesigned individual chromosome view.

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Chromosome Mapping Did you know? Tips

Changing segment layer order: did you know? #1

You can change the segment layer order within any DNA Painter chromosome map by dragging and dropping the groups in the key. This article, the first in a new series, explains how this works.

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Chromosome Mapping Opinion

My painted populations: comparing 23andMe, AncestryDNA and FamilyTreeDNA

Following the release of the AncestryDNA Chromosome Painter, I thought it would be interesting to compare the offering of each company that now offers segment data for their ancestral composition (aka “ethnicity”) estimates. My family’s estimates are probably more interesting than they will be for those who have fewer different ancestries in their background. You

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Chromosome Mapping New Features Tools

New: AncestryDNA Chromosome Painter Segments

Earlier in July 2022, AncestryDNA launched a new feature: Chromosome Painter. In this post I’ll introduce a new tool that allows you to extract segment data that you can use to paint population information in your DNA Painter chromosome map.

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