+386 (0)1 723 01 80Komplet - Development of the Microspore Mother Cells - of Lilium candidum – 12 mikro. preparatov
Vsebuje:
8501e Lilium. Leptotene, the chromosomes appear as fine threads
8502e Lilium. Zygotene, the homologous chromosomes associate in pairs. The chromosomes appear as strings of beads
8503e Lilium. Pachytene, complete pairing of the chromosomes
8504e Lilium. Diplotene, shortening of the chromosomes by contraction. Interchange of chromatin between the maternal and paternal chromosomes (crossing over)
8505e Lilium. Diakinesis, further contraction of the bivalents, the nuclear membrane disappears
8506f Lilium. Metaphase and anaphase of the first (heterotypic) division, showing spindle threads. Two haploid sets of chromosomes are separated
8507f Lilium. Telophase of the first and prophase of the second division
8508f Lilium. Metaphase and anaphase of the second (homeotypic) division, two mitotic figures are present
8509f Lilium. Pollen tetrads, four nuclei are formed after the second division, each bearing the haploid number of chromosomes. Formation of cell walls
8510e Lilium. Uninucleate microspores after separation of daughter cells
8511e Lilium. Mature two-nucleate pollen grains at the time of shedding. Each pollen grain possesses a tube cell and a generative cell
8512b Lilium. Mature pollen grains, w.m. to show structure of the cell walls