Raw Data Question

[prairielad]

In Raw Data, each SNP lists the base of each position on each chromosome you inherit from each parent.

ie)rs3131972 1 742584 AG
A is the base of chromosome received from parent A at that position
G is the base of chromosome received from parent B at that position

Now looking at ONLY Chromosome 1 as an example, does anyone know if results are listed according to left letter representing Parent A and right letter as Parent B

ie)
rs3131972 1 742584 AG
rs12562034 1 758311 GG
rs12124819 1 766409 AG
rs11240777 1 788822 AG
rs6681049 1 789870 CC
rs4970383 1 828418 CC
rs4475691 1 836671 CC

Parent A base sequence would be AGAACCC
Parent B base sequence would be GGGGCCC

Or is letter representation mixed, each base pair listed could come from either Parent A or Parent B.

[mkdexter]

Or is letter representation mixed, each base pair listed could come from either Parent A or Parent B.

This one. they are all mixed up. You have to compare the entire list to a parent, thus phasing it.

Matt.

[prairielad]

This one. they are all mixed up. You have to compare the entire list to a parent, thus phasing it.

Matt.

That is what I figured when comparing two siblings kits together.

Is there a way of phasing using siblings results. My Test kits are of siblings (my father and his sister). I plan to test all my fathers siblings, 3 more sisters and 2 brothers.

[JSW]

Phasing

RE "Is there a way of phasing using siblings results. My Test kits are of siblings (my father and his sister). I plan to test all my fathers siblings, 3 more sisters and 2 brothers. "

In general phasing is done using ancestors (Parents/Grandparents/Aunts/Uncles)
or cousins is you know the side (maternal/paternal)
Using siblings has many logic problems but can be useful for short segments
where you are sure there are no crossovers.
Phasing has great value in reducing the random Identical By State, IBS matches
that show up at the 12 cM and less lengths
I have heard that one can deduce a parents DNA from 4 children you will have
six do maybe you can deduce your grand parents.
I suspect this will require a lot of manual work an a segment by segment
chromosome by chromosome bassis