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Across 1. persons who believe they were born with the body of the other gender. 6. the distinguishing character of the individual: who each of us is, what our roles are, and what we are capable of. 7. the body's tendency to maintain a steady internal state. 8. twins who are genetically identical. 11. unlearned, incoluntary responses that occur automatically in the presence of certain stimuli. 12. rod-shaped structures that contain all basic hereditary information. 13. the parts of the chromosomes through which genetic information is transimited.

Down 2. a severe eating disorder in which people may refuse to eat while denying that their behavior and appearance-which can become skeleton-like-are unusual. 3. the factors that direct and energize the behavior of humans and other organisms. 4. motivational tension, or arousal, that energizes behavior to fulfill a need. 5. inborn patterns of behavior that are biologically determined rather than learned. 9. body weight that is more than 20 percent above the average weight for a person of a particular height. 10. a disorder in which a person binges on large quantities of food, followed by effor to purge the food through vomiting or other means.