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One Wrong Letter

This video segment from NOVA: "Cracking the Code of Life" illustrates the power of the genetic code. The video tells the stories of two couples following the discovery that their child has Tay-Sachs disease, an incurable disorder caused by the misspelling of just one letter out of three billion in the entire human genome.

The web page is located within Teachers'Domain, an online educational resource produced by WGBH Boston. It has two related components ? collections and courses ? that help teachers enhance their students' learning experiences and advance their own teaching skills. The Teachers' Domain collections include classroom-ready multimedia resources for use in lessons or independent study. Registration is free for everyone (teachers, students, parents).