J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Chromosomes. Coloured light micrograph of the chromosomes from a normal male during the metaphase stage of mitosis (cell division). Three round nuclei (red) of other cells are also seen. Chromosomes are thread-like structures of the cell nucleus that carry genetic information in the form of genes. Each is seen to consist of two strands (chromatids) joined in a region known as the centromere. Every chromosome can construct an exact copy of itself whilst the cell is in its resting stage between successive cell divisions. The next stage of mitosis, anaphase, is marked by the separation of paired chromatids & their migration to opposite poles of the cell.
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