TED-Ed: You could have a secret twin (but not the way you think) | Kayla Mandel Sheets

Karen Keegan's genetic testing revealed that two of her sons were not biologically hers, leading to the discovery of chimerism, a condition where an individual has two genomes. This occurs when cells from a twin or other source are absorbed, resulting in different genetic codes in the body. Chimerism can arise from various sources, including twin pregnancies and organ transplants. The case highlights the complexity of genetics, as similar occurrences have been documented in fathers. The phenomenon challenges our understanding of genetic identity, suggesting that many more people might carry multiple genomes.

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