I realize the passing of genes is approximately 50/50 (reference Generational Loss of Data with DNA testing) with each generation and which genes are passed are commonly referred to as 'random' based on existing science.
Like pointed out in one of the videos.. the 50/50 does not always apply and certain chromosomes can be preserved across generations.
Looking at my known relatives to a common shared ancestor I noticed this in Chromosome 1.
The main display person (dark blue background) and GREEN are half-siblings and share a common ancestor pair who is there great-grandX.
- Purple is the grand son of dark blue.
- Blue is GGGG-granddaughter of the common pair from a completely different child of the common pair.
- Orange is a GGG-granddaughter of another child of a common ancestor pair.
- Yellow is one of about 4 others of 350 matches who have a small sliver in the that same segment of that area.
This segment starts at 202478548 and in the matches so far go for at least 19.29 cMs to 217120123 (the orange).
Is there such a thing as a common family pair segment region (i.e. the 202.. to 217..) that could be considered something like a "trait" (terminology may not be correct) that can be used to hone in on a specific set of relatives (or one of their ancestors) and should it be specifically looked for or utilized as a tool even at smaller segment sizes?
In other words, I realize I should look for other alignments / strong matches / longer segments as well but is it a proven and reasonable technique to hone in on a specific segment range of a single Chromosome to identify a particular relative?