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Mitosis and Meiosis

Mitosis and Meiosis. Onion ( Allium ) Root Tip. Observe cells in the region just above the root cap . Root cap. Location of Mitotic Cells on Root Tip. Stages of Mitosis in Onion Root Tip. Whitefish Blastula Mitotic stages. Grasshopper Testis.

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Mitosis and Meiosis

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  1. Mitosis and Meiosis

  2. Onion (Allium) Root Tip

  3. Observe cellsin the region just above the root cap Root cap Location of Mitotic Cells on Root Tip

  4. Stages of Mitosis in Onion Root Tip

  5. Whitefish Blastula Mitotic stages

  6. Grasshopper Testis

  7. Spermatogenesis: Grasshopper TestesSpermatogonia (not yet in meiosis)

  8. Primary Spermatocyte in Meiosis I: 2n chromosomes, tetrads Secondary Spermatocyte in Meiosis II, 1n chromosome, dyads

  9. Grasshopper Testis

  10. Spermatids, 1n

  11. Mature Spermatozoa, 1n

  12. Mammalian Testes: Slide #10 p. 3 diagram Seminiferous tubules: tightly coiled tubules (~ 500 m) where millions of sperm are produced. Epididymis: sperm travels and matures in a 1-3 week journey.

  13. Interstitial space: Leydig cells  Testosterone

  14. Interstitial space: Leydig cells  Testosterone

  15. Ascaris Oviduct & Uterus P. 4 diagram Sperm Penetration Notice: Sperm head (haploid) have entered the eggs. Meiosis in the egg can only resume after sperm penetration. Note the lack of extensive membranes which will be seen to surround the egg later.

  16. Ascaris

  17. Ascaris

  18. Ascaris

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