Exchange (Meiosis Chiasmata)
22" h x 9" w
Exchange -- This piece shows the exchange of random pieces of DNA between paternal (green) and maternal (red) chromosomes..
During the formation of gametes -- sperm (or pollen) and eggs --maternal and paternal chromosomes come together and exchange pieces of genetic information -- DNA. This exchange of maternal and paternal genetic information which occurs during meiosis is the major source of genetic diversity in all sexually reproducing species. A stage in this process can be seen microscopically during prophase I, when non-sister chromatids of homologous chromosomes form attachment points known as chiasmata. This glass piece shows maternal (red) and paternal (green) chromosomes which have exchanged regions of DNA at these connection points.