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Y-axis The upright axis from top to bottom on a graph. Often used to display magnitude. Y Chromosome The chromosome for producing a male. Males have one X chromosome and one Y chromosome. Yerkes-Dodson Law An upside down U also know as the Inverted-U hypothesis. The state of arousal is displayed on the x-axis and the performance score is shown on the y-axis. An optimal level of arousal is demonstrated at the top of the inverted U. Too little arousal means poor performance. Too much arousal also means poor performance.   HOME | Site Map | Center Stage | Our Solutions | Our Satisfied Clients | Fitness Topics PFP Newsletter | Company Profile | Contact Information | Help | Glossary | ?Mark | About the Author | Disclaimer ©Copyright 1999-2003 Apriori, Inc. All Rights Reserved. APRIORIATHLETICS and Progressive Fitness Personality are Service Marks of Apriori, Inc. All products mentioned are trademarks or registered trademarks of their respective owners.