Gametogenesis

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Author:
MarineLopes
ID:
293580
Filename:
Gametogenesis
Updated:
2015-01-22 13:20:11
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  1. Which of the following types of germ cells does not undergo cell division?

    Spermatids.

    Primary oocytes.

    Spermatogonia.

    Secondary oocytes.

    Oogonia.
    Spermatids
  2. Oogonia are homologous to spermatogonia. Oogonia divide by mitosis during:

    All postnatal periods.

    Fetal life.

    Postnatal periods before puberty.

    Reproductive period.
    Fetal life
  3. What is the maximum number of oogonia and when does it happen?
    • 7 million
    • 5th month of development
  4. Prior to ejaculation, sperm are stored in the:

    Seminal vesicles.

    Efferent ductules.

    Epididymis.

    Ejaculatory ducts.

    Seminal colliculus.

    Ductus deferentes

    Tubuli reti
    Epididymis
  5. Reason why sperm are in epididymis?
    to obtain their full motility
  6. How many sperms, approximately, are deposited in the vagina during intercourse?

    300 THOUSAND.

    3 MILLION.

    30 MILLION.

    300 MILLION.

    3 BILLION
    300 million
  7. The first meiotic division of the primary oocytes is characterized by:

    Pairing of homologous chromosomes.

    Dna replication.

    Crossing over.

    Production of a polar body.

    Formation of chiasma
    • Pairing of homologous chromossomes
    • DNA replication
    • Crossing over = Chiasma formation
    • Production of polar body ( given off years later)
  8. The part of the sperm containing proteolytic
    enzymes to digest the zona pellucida is the:

    Capacitator.

    Head.

    Corona.

    Acrosome.

    Cumulus.
    Acrosome
  9. The part of the spermexposed to the process of capacitation is:

    Capacitator.

    Head.

    Corona.

    Acrosome.

    Cumulus.
    Acrosome
  10. The ovulated mammalian oocyte is arrested at:

    Prophase of meiosis I.

    Metaphase of meiosis I.

    Prophase of meiosis II.

    Metaphase of meiosis II.
    metaphase of meiosis II
  11. The long arrest in meiosis occurs in the primary oocyte . In what phase does that happen?

    Prophase of meiosis I.

    Metaphase of meiosis I.

    Prophase of meiosis II.

    Metaphase of meiosis II.
    Prophase of meiosis I
  12. The second meiotic division differs from the
    first meiotic division in that:

    Crossing over only occurs during meiosis I.

    There is a pairing of homologous chromosomes during meiosis I.

    There is no DNA synthesis during meiosis II.
    • Crossing over only occurs during meiosis I
    • There is a pairing of homologous chromossomes during meiosis I
    • There is no DNA synthesis during meiosis II
  13. The zona pellucida:

    Is synthesized by the oocyte during oogenesis.

    Contains species-specific sperm receptor molecules.

    Is modified post-fertilizaion to block polyspermy.

    Is designed to receive only sperm from the same species

    After penetration of the sperm in the zona, the zona reaction occurs, making the zone impermeable to other sperm
    • is synthesized by the oocyte during oogenesis
    • Contains species-specific sperm receptor molecules
    • is modified pos-fertilization to block polyspermy
    • is designed to receive only sperm from the same species
    • After penetration of the sperm in the zona, the zona reaction occurs, making the zona pellucida impermeable to other sperm.
  14. Nondisjunction is the result of an abnormal meiotic division that:

    Is thought to occur during oogenesis.

    Can result in autosomal trisomy.

    Can result in an individual with 47 chromosomes.

    Can be the result of homologous chromosomes failing to separate.

    Occurs during meiotic division of sex cells
    • Is thought to occur during oogenesis
    • Can result in autosomal trisomy
    • Can result in an individual with 47 chromosomes
    • Can be the result of homologous chromosomes failing to separate
    • Occurs during meiotic division of sex cells
  15. During gametogenesis, meiosis occurs which reduces the chromosome number from:

    Diploid to haploid.

    Haploid to tetraploid.

    Dizygotic to monozygotic.

    Bicornate to unicornate.

    Azygos to hemiazygos.
    Diploid to haploid
  16. How is the diploid number restored in human life?
    Fertilization
  17. The human male has how many different chromosomes?

    48.

    46.

    47.

    24.

    26.
    24
  18. As the follicle grows, the oogonium becomes located in a mound of follicle cells called the:

    Vesicular antrum.

    Oocyte.

    Cumulus oophorus.

    Liquor folliculi.
    Cumulus oophorus
  19. What's the name of the liquid that fills the antrum?
    Liquor folliculi
  20. How many different chromosomes are there in a human female?

    48.

    46.

    47.

    23

    24.

    26.
    23
  21. The secondary oocyte completes the second maturation division:

    Before ovulation.

    During ovulation.

    At fertilization.

    Before birth.

    Before puberty.
    At fertilization
  22. Spermatogonia, derived from primordial germ cells, divide by mitosis during:

    Postnatal periods.

    Prenatal periods.

    Postnatal periods after puberty.

    Reproductive period.

    Puberty.
    Puberty
  23. The process of spermiogenesis involves, along with other events, the addition of a cap containing proteolytic enzymes to the head of the male sex cell.  Immediately prior to spermiogenesis, the male sex cells are called:

    Spermatids.

    Primary oocytes.

    Secondary oocytes.

    Epidydimis.

    Acrosomes

    Spermatogonia.

    Oogonia.

    Cumulus oophorus.

    Spermatozoa.

    Polar bodies.
    Spermatids
  24. Immediately prior to ovulation, the first meiotic division, which had been arrested in prophase I, resumes. This transforms the developing sex cells into, ______, which becomes arrested again at the second metaphase of meiosis.

    Spermatids.

    Primary oocytes.

    Secondary oocytes.

    Epidydimis.

    Acrosomes

    Spermatogonia.

    Oogonia.

    Cumulus oophorus.

    Spermatozoa.

    Polar bodies.
    Secondary oocytes

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