Black Americans In The North & West Coast Have More White DNA Then Blacks In The South

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HOW SLAVERY CHANGED THE DNA OF AFRICAN AMERICANS
Widespread sexual exploitation before the Civil War strongly influenced the genetic make-up of essentially all African Americans alive today.
MICHAEL WHITE
  • nearly 400,000 Africans over to the colonies and, later, the United States. Once in North America, African slaves and their descendants mixed with whites of European ancestry, usually because enslaved black women were raped and exploited by white men. And, more recently, what’s known as the Great Migration dramatically re-shaped African-American demographics in the 20th century. Between 1915 and 1970, six million blacks left the South and settled in the Northern, Midwestern, and Western states, in hope of finding opportunities for a better life.

    recently published study, a team of researchers at McGill University in Montreal turned to this data to take a broad look at the genetic history of African Americans.

    AFRICAN AMERICANS WITH A HIGHER FRACTION OF EUROPEAN ANCESTRY, WHO OFTEN HAVE LIGHTER SKIN, HAD BETTER SOCIAL OPPORTUNITIES AND WERE THUS IN A BETTER POSITION TO MIGRATE TO NORTHERN AND WESTERN STATES.
    The researchers focused on nearly 4,000 African Americans who participated in two important studies, both sponsored by the National Institutes of Health. The Health and Retirement Study consists of older volunteers sampled from urban and rural areas across the U.S., while the Southern Community Cohort Study focuses on African Americans in the South, particularly areas that have a disproportionately high burden of disease. Together, these two studies are among the largest sources of genetic data on African Americans. Importantly, they represent a geographically broad sampling of the African-American population, which is critical for outlining the patterns of genetic history.

    different genetic risk factors for the same diseases. African Americans are disproportionately affected by many common diseases, and while much of this is due to poverty and limited access to good health care, genetics plays a role as well. If African Americans are to fully benefit from modern health care, where diagnoses and treatments are increasingly tailored to a patient’s DNA, it is critical that we understand African Americans’ genetic history, and how it contributes to their health today. In other words, we need to understand not just the cultural and economic legacies of slavery and discrimination, but the genetic legacy as well.
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How Slavery Changed the DNA of African Americans

They found very strong genetic connections between African-Americans in the Deep South and those in the Northeast and Midwest.

The genetic similarities in African-Americans tend to cluster along the very train lines that their forebears took as they left the Jim Crow South: the Illinois Central to Chicago, for example, and the Atlantic Coast line up the East Coast.

The scientists were intrigued to find that European Americans who live in the South now are more closely related to African-Americans in the North or West than to present-day African-Americans in the South.

Dr. Gravel has proposed a surprising explanation: “The first people to migrate out of the South were the ones with the most European ancestry,” he said.
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Tales of African-American History Found in DNA
 
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