Sweet potato root, stained with acridine-orange
Bacillus subtillis, stained with acridine-orange
Spinach root, stained with acridine-orange
Spinach leaves, stained with acridine-orange
Diatoms, stained with acridine-orange
This set includes Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis, Metaphase and anaphase of the first (heterotypic) division, Telophase of the first and prophase of the second division, and more.
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1 - Leptotene, the chromosomes appear as fine threads
2 - Zygotene, the homologous chromosomes associate in pairs. The chromosomes appear as strings of beads
3 - Pachytene, complete pairing of the chromosomes
4 - Diplotene, shortening of the chromosomes by contraction. Interchange of chromatin between the maternal and paternal chromosomes (crossing over)
5 - Diakinesis, further contraction of the bivalents, the nuclear membrane disappears
6 - Metaphase and anaphase of the first (heterotypic) division, showing spindle threads. Two haploid sets of chromosomes are separated
7 - Telophase of the first and prophase of the second division
8 - Metaphase and anaphase of the second (homeotypic) division, two mitotic figures are present
9 - Pollen tetrads, four nuclei are formed after the second division, each bearing the haploid number of chromosomes. Formation of cell walls
10 - Uninucleate microspores after separation of daughter cells
11 - Mature two-nucleate pollen grains at the time of shedding. Each pollen grain possesses a tube cell and a generative cell
12 - Mature pollen grains, w.m. to show structure of the cell walls