Glossary

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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.

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