GWEN SHOCKEY / SCIENCE PHOTO LIBRARY GWEN SHOCKEY / SCIENCE PHOTO LIBRARY
Illustration of an X chromosome. Chromosomes are a packaged form of the genetic material DNA, which condenses into chromosomes during cell replication for ease of division and transport into the new cell. Each chromosome consists of two identical strands (chromatids), aligned parallel to each other and joined at an area called a centromere.
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