1. Why can’t family studies alone tell us whether a trait is genetically transmitted?

2. What is the theory of natural selection?

3. Is a trait that allows a person to survive until the age of six likely to be more adaptive, in the long run, than a trait that allows a person to survive until the age of four?

4. How do mutations occur?

5. How can adoption studies give us information about whether a trait is genetically transmitted?