Understanding the human body is a team effort. That's where the Yachtel group comes in.

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When it comes to a guide for your gut, count on Yacolt.

This is Scientific Americans' 60-second science.

I'm Erica Barris. Got a minute?

It's called the Great Migration, the journey of some 6 million African Americans from the rural south to northern and western cities between 1910 and 1970.

The cultural impact of the Great Migration has been well documented, but researchers have also started to look at its genetic implications.

The most recent study finds that the migration had a significant effect on genomic diversity across the nation.

That work is in the journal plus genetics.

To estimate patterns of ancestry, researchers analyzed genetic data from nearly 4,000 African Americans who had participated in three medical studies.

Their findings confirmed historical records.

Genetic evidence showed that female slaves often gave birth to children fathered by white slave owners.

The genetic analysis found that 82.1% of the average African-American's

ancestors came from Africa, while 16.7% were Europeans and 1.2% were Native American. The team also

could date when particular genes entered the mix. Native American genes were introduced into

the typical African-American

genome in the early 1600s. Genes from Europeans were for the most part introduced in the

decades before and during the Civil War. Researchers also found those still living in the

southern United States have a greater percentage of African ancestry than those in the north or

...