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This project evaluates your understanding of the unique inheritance of autosomal DNA, the limitations of atDNA testing, and how atDNA is transmitted from one generation to the next.
The following is a comparison of the DNA of a paternal grandfather and a grandson on chromosome 1, where gray indicates the chromosome and brown indicates the shared segments of DNA:
On the basis of your understanding of autosomal DNA and this comparison, answer the following questions:
Hallie’s family tree is below. Amazingly, Hallie has tested all of her grandparents and five of her eight great-grandparents. Three of her great-grandparents, unfortunately, are deceased. Based on the results of the testing, Hallie has determined exactly how much DNA she obtained from the grandparents and great-grandparents that were tested, as shown in the table below.
Ancestor | Shared Percentage | |
Grandparents | John | 24.0% |
Jane | 26.0% | |
Chris | 20.0% | |
Cindy | 30.0% | |
Great-grandparents | Hugh | 14.0% |
Helen | 10.0% | |
Philip | DECEASED | |
Phyllis | 15% | |
Thomas | DECEASED | |
Theresa | 10.0% | |
Morris | DECEASED | |
Mary | 17.0% |
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