Structure of a Chromosome
Chromosomes are made up of arms called chromatids. Each chromosome has a short arm, designated as "p," and a long arm, designated as "q."
The centromere is the region where the 2 chromatids are held together.
Telomeres are regions at the ends of each arm of a chromosome.
A DNA molecule is 2 strands of DNA that wind around each other to resemble a spiral staircase containing millions of steps. Each extremely long DNA molecule is coiled up inside one of the chromosomes.
Credit: GWEN SHOCKEY / SCIENCE PHOTO LIBRARY
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