Just as scientists proved that the descendants of slave Sally Hemings had also descended from Thomas Jefferson or a close male relation of his, you can compare your chromosomes to those of other folks to whom you may be related. Every man's cheek swab contains a Y chromosome identical to his father's—and his father before him. And anyone's sample contains mitochondrial DNA passed intact from his or her mother. Any two people whose Y chromosomes or mitochondrial DNA match have a forebear in common. … Back to Article
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