Phasing Siblings to Grandparents - cross-overs

[Canyon Wolf]

Interpreting specific chromosome matches

Despite the fact your C15 looks like it might triangulate, the size (less then 10cM, and especially because it is less than 500 SNPs) makes it highly questionable. I would not form any conclusions based on this match alone.

Your...

[Canyon Wolf]

NPE

Another possibility would be the Great-grandmother's brother is actually the father (this does not have to be incest). Perhaps a brother or male cousin is the father and perhaps the child was adopted/raised by the sister and her husband. Since you are not matching people with your...

[Canyon Wolf]

Prehaps this is FTDNA's fault !

It may have nothing to do with your e-mail.

Sometime in the past two weeks, all of my kits mysteriously changed from public to private all by themselves. I am seeing others mentioning this problem in other forums but I have not seen anything...

[Canyon Wolf]

Perhaps only a 1/2 cousin

Any chance the ancestor had more than one wife and the two lines comes from a different mother?

[Canyon Wolf]

Ethnicity is only a PREDICTION

Ethnicity is only a PREDICTION and a prediction as low as 3% could easily be wrong or it could refer to an ancestry that is much further back in time.

Additional FF tests will assist you in working through family mysteries but will probably...

[Canyon Wolf]

Try gedmatch

Try using the admix utilities at gedmatch.com

The Eurogenes k9b filter is supposed to be equivalent to the Geno 2.0 predictions and most folks seem to think Geno 2.0 has the best ethnicity predictions.

I have seen FF ethnicity results from several...

[Canyon Wolf]

I think we need more information.

I think we need the ability to try this out on a lot of folks to see if the results are consistent.

[Canyon Wolf]

Be careful - do not assume



Please take careful note of the word ALMOST in the above sentence!

I had a similar situation where a female did not APPEAR to match one of her male siblings on the X. In the process of trying to phase the X I discovered that the...

[Canyon Wolf]

23andMe Special Chip

It is my understanding that 23andME has a custom chip that tests a lot of SNPs related to health. The other companies do not test these SNPs, therefor no 3rd party tools can answer your health questions using non 23andME kits.

[Canyon Wolf]

Another question comes to mind

For the sibling with 3 cross-overs

1 cross-over is more or less in the middle and the other two are towards the ends of the chromosome.

I think the simplest answer is to choose the middle one for the single chromosome cross-over...

[Canyon Wolf]

This is a follow up to the thread Segment Matches with Grandparents Using Crossover Lines with Kathy Johnston's helpful tutorial on phasing siblings.

I have finished my skeleton map for 4 siblings using Kathy's guidelines. I find 1 sibling shows three cross-overs, 2 siblings show two...

[Canyon Wolf]

Great Help with phasing

Kathy, once again you have been extremely helpful with my understanding of phasing.

[Canyon Wolf]

Thanks again Kathy.

X Phasing this group of 2nd generation descendants has been extremely useful to my project.

You have been so helpful concerning this phasing stuff. You got me started with a 1st generation autosome map not too long ago but things went down hill. So I decided...

[Canyon Wolf]

Thanks - I really think I am starting to get a good handle on phasing. I guess it is time to go back to the autosomals and see how far I get phasing them before I run into trouble

[Canyon Wolf]

Additional Thoughts

I have kits for 3 male siblings of the mother (K's uncles) and a daughter of a 4th male sibling. These kits represent male X chromosomes, therefore can only match with K on her mother's maternal X.

> K does not match any of her uncles or the cousin...