Practice Quiz - Prefertilization Events 1. Which of the following types of germ cells does not undergo cell division? spermatogonia primary oocytes spermatids secondary oocytes oogonia 2. Oogonia are homologous to spermatogonia. Oogonia divide by mitosis during: all postnatal periods fetal life postnatal periods after puberty the reproductive period none of the above 3. Prior to ejaculation, sperm are stored in the: seminal vesicles efferent ductules epididymis ejaculatory ducts seminal colliculus 4. How many sperms, approximately, are deposited in the vagina during intercourse? 300 thousand 3 million 30 million 300 million 3 billion 5. The first meiotic division of the primary oocytes is characterized by: pairing of homologous chromosomes DNA replication crossing over production of a polar body all of the above 6. The part of the sperm containing proteolytic enzymes to digest the zona pellucida is the: capacitor head corona acrosome cumulus 7. The ovulated mammalian oocyte is arrested at: prophase of meiosis I metaphase of meiosis I prophase of meiosis II metaphase of meiosis II none of the above 8. The second meiotic division differs from the first meiotic division in that: crossing over only occurs during meiosis I there is pairing of the homologous chromosome during meiosis I there is no DNA synthesis during meiosis II all of the above none of the above 9. The zona pellucida: is synthesized by the oocyte during oogenesis contains species-specific sperm receptor molecules is modified post-fertilization to block polyspermy all of the above none of the above 10. 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 all of the above are correct 11. During gametogenesis, meiosis occurs which reduces the chromosome number from _______ to _______. diploid to haploid haploid to tetraploid dizygotic to monozygotic bicornate to unicornate azygos to hemiazygos 12. The human male has how many different chromosomes? 48 46 47 24 26 13. As the follicle grows, the oogonium becomes located in a mound of follicle cells called the: vesicular antrum oocyte cumulus oophorus liquor folliculi none of these 14. How many different kinds of chromosomes are there in a human female? 22 23 24 25 47 15. The secondary oocyte completes the second maturation division: before ovulation during ovulation at fertilization before birth before puberty 16. Spermatogonia, derived from primordial germ cells, divide by mitosis during: postnatal periods prenatal periods postnatal periods after puberty the reproductive period puberty 17. 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 epididymis acrosomes spermatogonia oogonia cumulus oophorus spermatozoa polar bodies 18. 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 epididymis acrosomes spermatogonia oogonia cumulus oophorus spermatozoa polar bodies 19. Which meiosis phase (I or II) does replication of DNA/crossing-over and centromere division of chromosomes occur respectively? Meiosis II / meiosis I Meiosis I / meiosis II Meiosis I / meiosis I Meiosis II / meiosis II 20. A 4-year-old healthy female presents to your office to establish primary care. What phase of meiosis should her oocytes be in? Meiosis I - prophase Meiosis II - prophase Meiosis I - metaphase Meiosis II - metaphase 21. A 24 year-old healthy female presents for her pap smear. She has regular periods that last 5-7 days and occur every 30 days. She denies abnormal pain, bleeding, discharge, or history of positive pap smears. What phase of meiosis should her selected oocyte be in? Meiosis I - prophase Meiosis II - prophase Meiosis I - metaphase Meiosis II - metaphase 22. A 3 year-old male patient presents with epicanthal folds, flat nasal bridge, single palmar crease. The patient is 47 XY on karyotype. What could be the cause of this karyotype? Chromosomal mutation Chromosomal inversion Chromosomal nondisjunction Chromosomal deletion
