Regio X
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I get what you mean. However, this inference won't be always realistic, of course. It depends on what one inherited from each parent. For example, if I multiply by 2 what I inherited from my father (or my mother) according to 23andMe, the resultant scores are very different from his (or her) actual scores.You do understand that "phased results" means that you have to add up the results from each parent, right? So to infer each parent's composition, you need to multiply their scores by 2. Otherwise the score is only 50%.
I questioned 23andMe on that a bit more than a year ago. They answered that trio-phasing increases the resolution of the set of results - parent(s)' and child's - but that a child's results increase in resolution even more. That's why, still in their words, a child may have more detailed assignments than their parents. They said discrepancies can arise when comparing what can be seen in a child's results versus what can be seen in their parent(s)' results. They said, additionally, that viewing the results in the speculative threshold - the least confident prediction of ancestry - magnifies any discrepancies when comparing results. This was the explanation, convincing or not.Anyway, 23andMe's Ancestry composition is not very reliable. I have seen many times individuals with a few percents of some admixtures that wasn't present in their parents, which is normally impossible.
So, for example, if each of my parents have 1% of Iberian and I have, say, 5%, then my parents supposedly have some Iberian % "hidden" in the Broadly Southern European - or Broadly European (?).
@Angela
It happened again. Please see.
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