Gametogenesis

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Author:
Shira
ID:
271777
Filename:
Gametogenesis
Updated:
2014-04-24 20:17:14
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Bio Lab
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Questions pertaining to gametogenesis
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  1. The formation of sperm is called __?__.
    Spermatogenesis
  2. The formation of eggs is called __?__.
    Oogenesis
  3. Sperm and eggs are called __?__.
    Gametes
  4. The formation of sperm or eggs is called __?__.
    Gametogenesis
  5. The process by which spermatids form sperm is called __?__.
    Spermiogenesis
  6. How many chromosomes do primary spermatocytes have?
    46
  7. Are those chromosomes in primary spermatocytes duplicated or unduplicated?
    Duplicated
  8. How many chromosomes do spermatids have?
    23
  9. Are those chromosomes in spermatids duplicated or unduplicated?
    Unduplicated
  10. Name the cell that divides by meiosis II (spermatogenesis).
    Secondary spermatocyte
  11. Name the cell that divides by meiosis I (spermatogenesis).
    Primary spermatocyte
  12. Name the cell that divides by mitosis (spermatogenesis).
    Spermatogonium
  13. In which organ does sperm formation takes place?
    Testes
  14. Nurse cells are also called __?__ or __?__ cells.
    Sertoli; sustentacular
  15. What is the function of nurse cells?
    • Blood-testes barrier
    • Provide nutrients for developing cells
    • Produce chemicals needed for spermatogenesis
  16. Name the tube in which spermatogenesis takes place.
    Seminiferous tubules
  17. Are the least mature sperm closest to or furthest from the lumen of the tube in which spermatogenesis takes place?
    Furthest
  18. For each primary spermatocyte to undergo the process of sperm formation, how many sperm are formed?
    4
  19. How long does the process of sperm formation take?
    64-72 days
  20. About how many sperm does a mature male produce per day?
    400 million
  21. Do spermatognium A or B mature into primary spermatocytes?
    B
  22. Do spermatognium A or B undergo mitosis?
    A
  23. Are spermatognium A or B further from the lumen of the tube in which spermatogenesis takes place?
    A
  24. How many chromosomes do primary oocytes have?
    46
  25. Are the chromosomes in primary oocytes duplicated or unduplicated?
    Duplicated
  26. How many chromosomes do first polar bodies have?
    23
  27. Are the chromosomes in first polar bodies duplicated or unduplicated?
    Duplicated
  28. Name the cell that divides by meiosis II (oogenesis).
    Second oocyte, First polar body
  29. Name the cell that divides by meiosis I (oogenesis).
    Primary oocyte
  30. Name the cell that divides by mitosis (oogenesis).
    Oogonium
  31. In which organ does egg formation take place?
    Ovaries
  32. Name the structures in which egg formation take place. These structures are within the organ in which egg formation take place.
    Follicles
  33. How many eggs are formed, at best, for each primary oocyte to undergo the process of egg formation?
    1
  34. When does mitosis of oogonia stop?
    5th month of gestation
  35. When mitosis of oogonia stops, how many oogonia does the female fetus have?
    6-7 million
  36. When a baby girl is born: name her egg cells. These eggs are arrested in __?__.
    Primary oocyte; Prophase I
  37. About how many egg cells does a female baby have at birth?
    2 million
  38. About how many egg cells does a girl have at puberty?
    400,000
  39. Name the cell that is ovulated.
    Secondary oocyte
  40. In which phase is the egg cell that is ovulated arrested in?
    Metaphase II
  41. Name the cell that is fertilized.
    Secondary oocyte (divides into ovum)
  42. In which phase is the egg cell that is fertilized arrested in?
    Metaphase II
  43. An ovum is formed only if __?__ takes place.
    sperm penetration
  44. During meiosis I and meiosis II, there is an uneven division of __?__.
    cytoplasm
  45. Why is there an uneven division of cytoplasm during meiosis I and meiosis II?
    Because it ensures that the penetrated egg has nutrients o its 7 day journey to the uterus.

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