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Questions for Discussion: Genetics: Tour of the Basics

How can a four "letter" code provide information that determines many, many different traits?
What is the relationship between a DNA "word" and "sentence"?
All of our genes are made of DNA. What makes one gene different from another?
If each of our cells contains the same DNA, why is a liver cell different from a nerve cell?
Why are most human traits not inherited in the simple manner depicted for the hitchhiker's thumb?