BRYSON BIOMEDICAL ILLUSTRATIONS / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY BRYSON BIOMEDICAL ILLUSTRATIONS / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Artwork of the various phases of meiosis. In meiosis a cell in the testes or ovaries containing 46 chromosomes divides to form four germ cells (sperm or eggs) each one with 23 chromosomes. It involves two divisions. After the first one (top centre) two daughter cells are formed with haploid (23) chromosomes. The second division (bottom right and left) is a mitotic type of division, the result of which is the formation of four identical germ cells. During the first division there is exchange of material between the paired chromosomes so that each of the final germ cells receives a unique mix of the parental genes.
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