23&me not using Y chromosome for DNA relatives feature

[Touijer]

No, you are wrong. Did you read what I´ve posted?

Around 2% is the total of whole Y (and is also simplist and wrong because Y is shorter and contains less information than most of any other previous 44 chromosomes, and not sure if X is also longer than Y) and just some parts of the Y has SNPs (or STRs , that are just chunks of repetitions of some SNPs(actually chains of nucleotides but not "single") in the same order) are used to determine Ydna haplogroups.

Check your BIG Y if you have it and you can see what I am telling you.

It’s not only me that says it, ChatGPT says it too. I think you’re mixing up things.





Every male regardless of haplogroup shares around 0,5% of the Y chromosome which is basic genetic material. You share 100% of that Y dna with your father, the same mutations and genetic markers. Depending on the haplogroup and subclade that figure can be 90% with other members of your subclade because of shared mutations and genetic markers. Every haplogroup has genetic markers unique to them, it’s simple really.

[Boudin]

I think it’s because many people will get millions of relatives so the whole point would be boring, or they want to include women too, so they’re not left out hence why they use X chromosome that every gender has but not Y that only one has.

It's because the X chromosome undergoes normal crossover in females, so it's rate of change and thus utility for determining ancestry and relatives is comparable to that of the other chromosomes.

[Boudin]

23andMe has actually published an article discussing the challenges of using the X-chromosome in ancestry estimation, Challenges of accurately estimating sex-biased admixture from Xchromosomal and autosomal ancestry proportions.