Population geneticist Dr. Janina Jeff is Christopher Caldwellthe host and executive producer of In Those Genes, a hip-hop inspired podcast that uses genetics to uncover the those lost identifies of African descended Americans through the lens of Black culture.

Short Wave co-host Emily Kwong speaks with Janina about what a person's genetic ancestry test does and does not reveal, and the complicated intersection of genetics, history and race.

Check out more of Janina's work on In Those Genes. Episodes references in today's Short Wave include:

• Scientific Sankofa

• Up In Dem' Genes

• Skinfolk, Kinfol

This episode was produced by Rebecca Ramirez, edited by Gisele Grayson and fact-checked by Rasha Aridi. Patrick Murray was the audio engineer. Special thanks to Natasha Branch.