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X-axis The horizontal axis from left to right. In exercise physiology the x-axis is often used to portray time. X-Linked Disorder Approximately one in four people inherit a defective gene on the X Chromosome. Females are unaffected by the defective gene because the recessive gene is not expressed in the presence of another dominant X Chromosome. Males are affected because they do NOT have a dominant X chromosome to counter the defective gene. Males have a Y Chromosome that is not dominant over the recessive X Chromosome. Expressions of the recessive gene include Color Blindness and some forms of Muscular Dystrophy. X-Ray A penetrating stream of photons that allows imaging of the body. Used in sports medicine especially to find fractures. X Chromosome Two X Chromosomes produce a female.   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.