Prophase I of meiosis, diakinesis substage in a diploid lily pollen mother cell. One bivalent is shown. It has 6-8 crossovers (also called chiasmata). The long arrows point at definite chiasmata; the short arrows to likely ones.
Feulgen stained light microscopy image collected using a bright field zeiss microscope, using a 100X, N.A. 1.4 Neuflar lens.