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autosmal-dna

Everything is below!
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:

Since this comparison is of a paternal grandfather and a grandson, it represents a single recombination. At least how many recombination events had to occur in order to observe this pattern?
Based on the above comparison alone, can you determine the segments of DNA on chromosome 1 that the grandson received from his maternal grandmother? Why or why not?
Let’s follow the same chromosome through to the next generation, to the grandson’s son, and compare it to the same paternal grandfather (now a great-grandfather). Could the comparison of the great-grandfather and great-grandson look like the result below? Why or why not?

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%

Based on the family tree and the graph, what are the correct percentages for Philip, Thomas, and Morris? Adding all the great-grandparents’ percentages together, what is the total? At the great-grandparent level, do any of the percentages seem high or low compared to expected amounts. If so, which one(s)? Why or why not?
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