There’s an interesting piece in today’s NYT about genetic testing African Americans. The researchers covered in the article calculate that “the ancestors of the average African-American today were 82.1 percent African, 16.7 percent European and 1.2 percent Native American.”
More interesting than that, by examining the length of matching DNA strands, they claim that the Native American genes got into the African American mix very early, as slaves were first brought from Africa, and that the European genes got into the mix later—primarily during the time just preceding the Civil War.
Furthermore, by tracing X and Y chromosomes—Xs come only from mothers; fathers can pass on Xs or Ys—and the fact that the X chromosome of contemporary African-Americans shows more African ancestry than do the Y, leads them to the conclusion that the 16.7 percent European ancestry is primarily due to white slave owners fathering the children of their black slaves.
Here is a link to the story: http://www.nytimes.com/2016/05/28/science/african-american-dna.html?emc=edit_th_20160528&nl=todaysheadlines&nlid=66175474
This Read The Article