Name Date Chapter Performance Task Genetic Ancestry What percentage of your DNA is from each of your ancestors? How can you determine your genetic ancestry? One way to determine your genetic ancestry is to find out what country or region all of your ancestors came from. Each person has two parents. About one-half, or 50%, of your DNA is from your mother and the rest of your DNA is from your father. 1. Complete the table. Ancestor Number of Each Fraction of Decimal of |Percent of Type of Ancestor Your DNA Your DNA Your DNA You 20 =1 1.0 100% Parents 21 = 2 NIP 0.5 50% Grandparents Great-grandparents Great-great-grandparents Great-great-great- Grandparents Great-great-great-great- grandparents a. About what percentage of your DNA is from one of your great-great-great-great-grandparents? b. Your friend researches his family and determines that about 20% of his great-great-great-great-grandparents are from Northern Europe. How many of your friend's great-great-great-great-grandparents are Northern European? Name Date Chapter Performance Task (continued) Genetic Ancestry 2. Scientists can use a DNA sample to learn about ancestry. The map shows the results of the same friend's DNA test. Northern European 0.10 Mediterranean Native 0.06 Southwest Asian American 75 African 30 a. Write the portion of your friend's ancestry from each region as a percent and order them from greatest to least. b. The DNA test was unable to determine all of the regions that your friend's ancestors came from. What percent of your friend's ancestors are from an unknown region? c. How many of your friend's great-great-great-great-grandparents are African? 3. Compare the results of your friend's research and the DNA test. Which method do you think is more accurate? Explain. Big Ideas Math: Modeling Real Life Grade 6 Copyright @ Big Ideas Learning, LLC All rights reserved. Assessment Book