Chromosome mapping at DNA Painter
Below are notes for those who attended the session at the Society of Australian Genealogists by webinar on 28 August 2020. Others are welcome to use these notes for their personal research. Please contact me at chrisw9953[at]gmail[dot]com for other uses. I'll strive to update the notes as there are further developments or my understanding of the area grows. Chromosome mapping is a methodology that- looks at the autosomal and X-DNA you share with your matches and identifies which ancestor or ancestral couple passed that segment of DNA to you. For males, we map chromosomes 1 to 22 and the X chromosome (at chromosome 23) inherited from the mother. For females, we map all chromosomes 1 to 23 as females get one X chromosome from their father and one from their mother. Why map chromosomes? It's fun! We know that we receive 50% of our DNA from our father and 50% our mother. But how much did we received from each of our 4 grandparents, 8 great-grandparents, 16 2nd great-grandpare