Human Anatomy and Reproduction Quiz
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Questions and Answers

What is the diploid number of chromosomes in germ line cells?

  • 23
  • 92
  • 46 (correct)
  • 69

    • What type of division occurs in germ line cells to produce gametes?

  • Meiosis (correct)
  • Binary Fission
  • Bud Formation
  • Mitosis

    • How many chromosomes do gametes contain after division?

  • 46 chromosomes
  • 34 chromosomes
  • 15 chromosomes
  • 23 chromosomes (correct)

    • Which process contributes to genetic variability during meiosis?

    <p>Independent Assortment</p> Signup and view all the answers

    Which of the following statements about haploid and diploid cells is correct?

    <p>Diploid cells contain more genetic information than haploid cells.</p> Signup and view all the answers

    What is the haploid number of chromosomes found in each gamete?

    <p>23 chromosomes</p> Signup and view all the answers

    What happens to the chromosome number at fertilization?

    <p>It restores to diploid number</p> Signup and view all the answers

    During which phase of meiosis does chromosomal crossover primarily occur?

    <p>Prophase I</p> Signup and view all the answers

    What structure connects sister chromatids after chromosome replication?

    <p>Centromere</p> Signup and view all the answers

    Which of the following best describes the difference between haploid and diploid cells?

    <p>Haploid cells contain one set of chromosomes, diploid cells two sets.</p> Signup and view all the answers

    What is the primary outcome of the separation phase during meiosis?

    <p>Separation of homologous pairs into two daughter cells</p> Signup and view all the answers

    How does meiosis contribute to genetic variability?

    <p>By allowing for crossing over and independent assortment</p> Signup and view all the answers

    Which term correctly describes cells with one complete set of chromosomes?

    <p>Haploid</p> Signup and view all the answers

    What is the chromosome composition of daughter cells produced at the end of meiosis?

    <p>Haploid, with half the chromosome number of the parent cell</p> Signup and view all the answers

    What occurs during chromosomal crossover in meiosis?

    <p>Homologous chromosomes exchange segments of genetic material</p> Signup and view all the answers

    What is the primary purpose of meiosis in germ cells?

    <p>To reduce the chromosome number to the haploid number</p> Signup and view all the answers

    During which stage of meiosis do cells replicate their DNA?

    <p>At the beginning of meiosis I</p> Signup and view all the answers

    How many types of meiosis are there?

    <p>Two types</p> Signup and view all the answers

    What does meiosis achieve in terms of chromosome sets?

    <p>It reduces the chromosome number to one set</p> Signup and view all the answers

    What cell type do primordial germ cells develop into?

    <p>Oogonia</p> Signup and view all the answers

    What process do diploid oogonia undergo during early fetal development?

    <p>Mitosis</p> Signup and view all the answers

    What significant event occurs to most germ cells before birth?

    <p>They degenerate by atresia</p> Signup and view all the answers

    What is the ploidy level of oogonia?

    <p>Diploid (2n)</p> Signup and view all the answers

    How do diploid oogonia contribute to the number of germ cells before birth?

    <p>They divide by mitosis to produce millions</p> Signup and view all the answers

    What is the primary process that occurs during fertilization?

    <p>The fusion of male and female gametes</p> Signup and view all the answers

    Which statement about in vitro fertilization is accurate?

    <p>It can utilize gametes preserved for many years</p> Signup and view all the answers

    What is the result of the fusion of male and female gametes?

    <p>Development of a zygote</p> Signup and view all the answers

    Which component is essential for fertilization to occur?

    <p>Compatibility of gametes</p> Signup and view all the answers

    What is the significance of gametes being frozen for long durations in the context of in vitro fertilization?

    <p>It allows for indefinite storage without effect on viability</p> Signup and view all the answers

    What happens to the morula once it enters the uterine cavity?

    <p>Fluid penetrates through the zona pellucida.</p> Signup and view all the answers

    What is formed as a result of fluid penetrating the inner cell mass?

    <p>The blastocyst.</p> Signup and view all the answers

    What is the role of the zona pellucida during the morula's development?

    <p>It allows fluid entry into the intercellular spaces.</p> Signup and view all the answers

    Which cell structure is involved in the interaction between the morula and the uterine cavity?

    <p>Intercellular spaces.</p> Signup and view all the answers

    What type of tissues does the inner cell mass of the blastocyst eventually contribute to?

    <p>All germ layers.</p> Signup and view all the answers

    What is the role of hyaluronidase during fertilization?

    <p>To assist in the penetration of the zona pellucida</p> Signup and view all the answers

    Which of the following enzymes are involved in the lysis of the zona pellucida?

    <p>Acrosin, esterases, &amp; neuraminidase</p> Signup and view all the answers

    What is the end result of the fusion of plasma cell membranes in fertilization?

    <p>Creation of a diploid zygote</p> Signup and view all the answers

    What is the significance of acrosomal enzymes in sperm function?

    <p>They facilitate penetration of the zona pellucida</p> Signup and view all the answers

    Which of the following processes occurs after the zona pellucida is lysed?

    <p>Sperm has a direct path to the oocyte</p> Signup and view all the answers

    What is the zona reaction responsible for during fertilization?

    <p>Making the zona pellucida impermeable to additional sperm</p> Signup and view all the answers

    What occurs at the completion of the second meiotic division of the oocyte?

    <p>The formation of a mature ovum and a second polar body</p> Signup and view all the answers

    Which change in the zona pellucida is crucial for preventing polyspermy?

    <p>Alteration in the molecular structure of the zona</p> Signup and view all the answers

    What is the outcome of the second meiotic division in oogenesis?

    <p>One large ovum and a smaller polar body are produced</p> Signup and view all the answers

    How does the zona reaction impact the fertilization process?

    <p>It prevents further sperm from entering after the first sperm has fertilized the ovum</p> Signup and view all the answers

    What occurs during prophase of mitosis?

    <p>Chromosomes begin to coil and condense</p> Signup and view all the answers

    Which stage of mitosis is characterized by the alignment of chromosomes at the equatorial plane?

    <p>Metaphase</p> Signup and view all the answers

    What major event occurs during anaphase of mitosis?

    <p>Chromatid migration to opposite poles</p> Signup and view all the answers

    At which stage of mitosis do daughter cells begin to form?

    <p>Telophase</p> Signup and view all the answers

    What is the primary role of mitotic spindles during mitosis?

    <p>To separate sister chromatids</p> Signup and view all the answers

    What is the function of the kinetochore during cell division?

    <p>To attach spindle fibers to chromosomes</p> Signup and view all the answers

    What is located at the centromere of a chromosome?

    <p>The point where sister chromatids are held together</p> Signup and view all the answers

    Which statement accurately describes a kinetochore?

    <p>It is a protein complex where spindle fibers attach</p> Signup and view all the answers

    During which cellular process is the kinetochore specifically active?

    <p>Cell division</p> Signup and view all the answers

    What is the primary role of the centromere in relation to sister chromatids?

    <p>To connect the sister chromatids during division</p> Signup and view all the answers

    What is the typical number of sperm that can enter the uterus during reproduction?

    <p>200-600 million</p> Signup and view all the answers

    What characteristic of sperm allows them to travel through the vagina effectively?

    <p>Highly motile properties</p> Signup and view all the answers

    What role does the isthmus play in the journey of sperm?

    <p>It aids in the peristaltic movement of sperm.</p> Signup and view all the answers

    In which part of the female reproductive system do sperm become highly motile?

    <p>Vagina</p> Signup and view all the answers

    Why is the motility of sperm critical for reproduction?

    <p>It allows sperm to reach the egg quickly.</p> Signup and view all the answers

    What is the process called where homologous chromosomes align themselves in pairs during meiosis?

    <p>Synapsis</p> Signup and view all the answers

    How do homologous chromosomes align themselves during synapsis?

    <p>They align in pairs, point for point.</p> Signup and view all the answers

    Which chromosome combination is noted as an exception during the pairing of homologous chromosomes?

    <p>XY</p> Signup and view all the answers

    What is a characteristic of the alignment of homologous chromosomes during synapsis?

    <p>It is exact and point for point.</p> Signup and view all the answers

    Which of the following statements is true about synapsis during meiosis?

    <p>It is essential for the pairing of homologous chromosomes.</p> Signup and view all the answers

    What is formed when the intercellular spaces become confluent during embryonic development?

    <p>Blastocyst</p> Signup and view all the answers

    Which term describes the cavity that forms within the blastocyst during early embryonic development?

    <p>Blastocele</p> Signup and view all the answers

    At what stage does an embryo become a blastocyst?

    <p>When the blastocele forms</p> Signup and view all the answers

    What developmental stage follows the merging of intercellular spaces in embryogenesis?

    <p>Blastocyst</p> Signup and view all the answers

    Which structure is indicative of the transition into the stage of a blastocyst in embryology?

    <p>Blastocele</p> Signup and view all the answers

    What is the primary event that occurs during implantation?

    <p>The penetration of the trophoblastic layer into the endometrium</p> Signup and view all the answers

    On which days does the process of implantation typically start and complete?

    <p>6th-8th day and completed by the 12th day</p> Signup and view all the answers

    What is the state of the endometrium during implantation?

    <p>Thick and nutrient-rich to support the developing embryo</p> Signup and view all the answers

    What is the role of the trophoblast during the implantation process?

    <p>To facilitate the entry of the blastocyst into the uterine lining</p> Signup and view all the answers

    Which statement accurately describes the timing of implantation?

    <p>It initiates on the 6th day and concludes by the 12th day</p> Signup and view all the answers

    What term describes stem cells that can differentiate into various cell types?

    <p>Pluripotent</p> Signup and view all the answers

    Which anatomical term refers to the front of the body?

    <p>Anterior</p> Signup and view all the answers

    What is the diploid number of chromosomes in somatic cells?

    <p>46</p> Signup and view all the answers

    In embryonic terminology, which term refers to the tail end of the body?

    <p>Caudal</p> Signup and view all the answers

    Which type of cell division do somatic cells undergo?

    <p>Mitosis</p> Signup and view all the answers

    What is the primary function of the kinetochore during cell division?

    <p>To facilitate the movement of chromosomes</p> Signup and view all the answers

    Which of the following statements is true about the centromere?

    <p>It is the region where sister chromatids are joined.</p> Signup and view all the answers

    What role do spindle fibers serve in relation to the kinetochore?

    <p>They attach to the kinetochore for chromosomal movement.</p> Signup and view all the answers

    What happens to sister chromatids after the centromere divides?

    <p>They are pulled apart toward opposite poles of the cell.</p> Signup and view all the answers

    Which structure is required for the attachment of spindle fibers during mitosis?

    <p>Kinetochore</p> Signup and view all the answers

    At what stage of life does spermatogenesis begin in males?

    <p>At puberty</p> Signup and view all the answers

    What is the duration required for spermatogenesis to complete one cycle?

    <p>64 days</p> Signup and view all the answers

    During which phase does oogenesis resume in females?

    <p>At puberty</p> Signup and view all the answers

    When do females begin the process of gametogenesis?

    <p>During the fetal period</p> Signup and view all the answers

    What transformation occurs in spermatogenesis?

    <p>Spermatogonia into spermatozoa</p> Signup and view all the answers

    What is a primary result of the crossover that occurs during meiotic divisions?

    <p>Redistribution of genetic material leading to genetic variability</p> Signup and view all the answers

    How does meiosis contribute to the genetic diversity of daughter cells?

    <p>Through the process of genetic recombination</p> Signup and view all the answers

    What occurs to the chromosomes in the daughter cells at the end of meiotic divisions?

    <p>Each daughter cell receives different combinations of chromosomes</p> Signup and view all the answers

    Which statement accurately describes the outcome of meiotic divisions?

    <p>Four genetically different daughter cells are produced</p> Signup and view all the answers

    Which process is primarily responsible for the genetic variability observed in daughter cells after meiosis?

    <p>Crossover and genetic recombination</p> Signup and view all the answers

    Which structure facilitates fluid penetration in the morula?

    <p>Zona pellucida</p> Signup and view all the answers

    Which of the following best describes the function of the zona pellucida in early development?

    <p>Protecting the inner cell mass from external factors</p> Signup and view all the answers

    Which component of the morula is primarily involved in the formation of tissues in the embryo?

    <p>Inner cell mass</p> Signup and view all the answers

    What process occurs when homologous chromosomes align themselves in pairs during meiosis?

    <p>Synapsis</p> Signup and view all the answers

    Which statement is true regarding the alignment of homologous chromosomes during synapsis?

    <p>It is exact and point for point except for XY combinations.</p> Signup and view all the answers

    What distinguishes the alignment of XY chromosomes from other homologous pairs during synapsis?

    <p>They align differently, lacking point-for-point pairing.</p> Signup and view all the answers

    Which aspect of synapsis contributes to the genetic diversity in gametes?

    <p>Point-for-point alignment and potential crossover.</p> Signup and view all the answers

    What is the main significance of the exact and point-for-point pairing of homologous chromosomes during meiosis?

    <p>To facilitate accurate genetic recombination.</p> Signup and view all the answers

    What is the first stage in the development of sperm cells from spermatogonia?

    <p>Spermatocytogenesis</p> Signup and view all the answers

    During meiosis, what type of cells are directly produced from spermatocytes?

    <p>Haploid spermatids</p> Signup and view all the answers

    What is the ploidy level of spermatogonia before they undergo spermatocytogenesis?

    <p>Diploid</p> Signup and view all the answers

    What is the primary characteristic of the cells produced after meiosis in spermatogenesis?

    <p>They contain a single copy of each chromosome.</p> Signup and view all the answers

    Which process occurs after spermatocytogenesis and before the formation of mature sperm?

    <p>Meiosis</p> Signup and view all the answers

    What is the maximum time frame during which an oocyte must be fertilized to avoid degeneration?

    <p>12 hours</p> Signup and view all the answers

    What physiological process has increased activity without any morphological changes in the uterus or uterine tubes?

    <p>Fertilization</p> Signup and view all the answers

    What happens to oocytes that are not fertilized within a certain period?

    <p>They degenerate</p> Signup and view all the answers

    In which part of the female reproductive system does the fertilization of an oocyte predominantly occur?

    <p>Uterine tubes</p> Signup and view all the answers

    What is a key consequence of fertilization occurring beyond the viable time frame for an oocyte?

    <p>Degeneration of the oocyte</p> Signup and view all the answers

    What role does the syncytiotrophoblast play during implantation?

    <p>It facilitates the embedding of the blastocyst into the endometrium.</p> Signup and view all the answers

    What occurs immediately after the blastocyst becomes embedded in the endometrium?

    <p>Closure of the implantation site by a fibrin clot.</p> Signup and view all the answers

    Which description best fits the function of the multinucleated protoplasmic mass formed during implantation?

    <p>It has a phagocytic function for debris clearance.</p> Signup and view all the answers

    What significant change occurs to the uterine wall after the blastocyst's embedment?

    <p>Regeneration of surface epithelial cells covering the implantation site.</p> Signup and view all the answers

    Which process is primarily facilitated by the syncytiotrophoblast during early pregnancy?

    <p>Digestion of uterine tissue.</p> Signup and view all the answers

    What does it mean for an embryo to be viable?

    <p>It is able to survive independently outside the uterus.</p> Signup and view all the answers

    Which description aligns with the term 'viable' in embryonic development?

    <p>Capable of independent function without maternal support.</p> Signup and view all the answers

    At what stage is an embryo considered viable?

    <p>When it has reached sufficient maturity to survive outside the uterus.</p> Signup and view all the answers

    What is a primary result of meiotic divisions that contributes to the diversity of daughter cells?

    <p>Crossover that redistributes genetic material</p> Signup and view all the answers

    Which statement accurately describes the chromosomal content of the daughter cells after meiosis?

    <p>Each daughter cell contains a unique combination of chromosomes</p> Signup and view all the answers

    Why is viability an important concept in developmental biology?

    <p>It indicates the point at which an embryo can survive away from maternal resources.</p> Signup and view all the answers

    How does the concept of viability influence pregnancy outcomes?

    <p>It influences decisions around prenatal care and intervention strategies.</p> Signup and view all the answers

    Which mechanism primarily ensures genetic variability during the process of meiosis?

    <p>Independent assortment of homologous chromosomes</p> Signup and view all the answers

    Which of the following correctly describes the genetic material distribution in the daughter cells post-meiosis?

    <p>Random distribution leading to diverse genetic combinations</p> Signup and view all the answers

    What aspect of meiosis primarily contributes to the genetic differences between the four daughter cells?

    <p>The occurrence of chromosomal crossover</p> Signup and view all the answers

    What is the first phase that sperm encounters during fertilization that is critical for its passage?

    <p>Corona radiata</p> Signup and view all the answers

    Which enzyme is specifically mentioned as playing a role in the fertilization process related to the sperm?

    <p>Hyaluronidase</p> Signup and view all the answers

    What is the primary function of the hyaluronidase enzyme during the fertilization process?

    <p>To lyse the zona pellucida</p> Signup and view all the answers

    In the context of fertilization, what structure must the sperm penetrate first after leaving the male body?

    <p>Cumulus layers</p> Signup and view all the answers

    Which of the following sequences is indicative of the initial interaction of sperm with the egg during fertilization?

    <p>Navigating corona radiata then acrosome reaction</p> Signup and view all the answers

    Germ line cells have a haploid number of chromosomes equal to 23.

    <p>False</p> Signup and view all the answers

    Meiosis results in gametes that possess the diploid number of chromosomes.

    <p>False</p> Signup and view all the answers

    A germ cell divides by mitosis to produce gametes.

    <p>False</p> Signup and view all the answers

    During meiosis, each germ cell divides twice to produce four gametes.

    <p>True</p> Signup and view all the answers

    The diploid number of chromosomes in humans is represented as 1n.

    <p>False</p> Signup and view all the answers

    Spermatogenesis in males begins as early as the age of 10.

    <p>False</p> Signup and view all the answers

    Oogenesis in females begins during the fetal period and resumes at puberty.

    <p>True</p> Signup and view all the answers

    The process of spermatogenesis requires approximately 45 days to complete.

    <p>False</p> Signup and view all the answers

    Gametogenesis in males and females occurs at the same developmental stage.

    <p>False</p> Signup and view all the answers

    Transformation of spermatogonia into spermatozoa is a lengthy process that can take up to two months.

    <p>True</p> Signup and view all the answers

    After puberty, meiosis I resumes in several secondary follicles, with only one follicle maturing fully to produce three haploid cells.

    <p>False</p> Signup and view all the answers

    Meiosis I results in the formation of two diploid cells.

    <p>False</p> Signup and view all the answers

    The secondary oocyte is the only cell that resumes meiosis after puberty.

    <p>True</p> Signup and view all the answers

    One of the outcomes of meiosis I is the production of identical sister chromatids.

    <p>False</p> Signup and view all the answers

    At the end of meiosis I, a secondary oocyte and a polar body are formed, both carrying genetic variations.

    <p>True</p> Signup and view all the answers

    The primary follicle develops into a secondary follicle when a cavity known as the antrum begins to form.

    <p>True</p> Signup and view all the answers

    In the formation of a secondary follicle, the cells surrounding the oocyte release a solid substance instead of fluid into the antrum.

    <p>False</p> Signup and view all the answers

    The emergence of the antrum is a definitive characteristic that marks the follicle as a primary follicle.

    <p>False</p> Signup and view all the answers

    As the follicle matures and becomes a secondary follicle, the oocyte remains unchanged and does not undergo any developmental stages.

    <p>False</p> Signup and view all the answers

    Cells around the oocyte cease to function once the follicle transforms into a secondary follicle.

    <p>False</p> Signup and view all the answers

    A secondary oocyte is a small cell that cannot be seen by the naked eye.

    <p>False</p> Signup and view all the answers

    The secondary oocyte remains in metaphase until fertilization occurs.

    <p>True</p> Signup and view all the answers

    After fertilization, the secondary oocyte will not resume meiosis II.

    <p>False</p> Signup and view all the answers

    The trophoblast is the inner cell layer of the late blastocyst that develops into the embryonic part of the placenta.

    <p>False</p> Signup and view all the answers

    At puberty, a female's ovary contains approximately 1 million mature secondary oocytes ready for ovulation.

    <p>False</p> Signup and view all the answers

    The zona pellucida is a covering of material that surrounds the secondary oocyte during follicle development.

    <p>True</p> Signup and view all the answers

    The zona pellucida is shed during the hatching process of the late blastocyst on day 5.

    <p>True</p> Signup and view all the answers

    On day 5 of development, blastomeres in the late blastocyst give rise to the mesoderm layer.

    <p>False</p> Signup and view all the answers

    The late blastocyst stage is characterized by the formation of the inner cell mass, which eventually contributes to the embryonic structures.

    <p>True</p> Signup and view all the answers

    The trophoblast layer is responsible for the initial establishment of the embryo's nutrition supply.

    <p>True</p> Signup and view all the answers

    Study Notes

    Trimester

    • Pregnancy is divided into 3 calendar months, 9 total months.
    • Abortion is the expulsion of an embryo or fetus before it's viable.
    • Viable means mature enough to survive outside the uterus.

    Directional Terminology and Body Planes

    • Anatomical position:
      • Anterior/Posterior
      • Superior/Inferior
      • Lateral/Medial
      • Caudal/Cranial
      • Dorsal/Ventral
      • Sagittal plane
      • Coronal section
      • Frontal plane
      • Transverse section

    Types of Cells

    • Somatic cells have 2 sets of chromosomes (diploid number = 46) and divide by mitosis.
    • Germ cells also have 2 sets of chromosomes (diploid number = 46) and divide by meiosis to produce gametes.
    • Gametes have 1 set of chromosomes (haploid number = 23).
    • Embryonic gametes form in the epiblast, then migrate to the yolk sac and gonads.
    • Humans have 23,000 genes on 46 chromosomes.
    • In somatic cells, chromosomes appear as 23 homologous pairs.
    • 22 pairs are autosomes, and 1 sex pair (XX = female, XY = male).
    • Each gamete (egg/sperm) has 23 chromosomes.
    • Fertilization restores the diploid number of 46 chromosomes.
    • Centromere: connects sister chromatids after chromosome replication.
    • Kinetochore: protein complex where spindle fibers attach during cell division.

    Cell Division

    • Mitosis: produces 2 identical daughter cells.
      • DNA replicates before mitosis.
      • Prophase, Prometaphase, Metaphase, Anaphase, Telophase, Daughter cells
      • Chromosomes condense and become visible.
      • Spindle fibers attach to chromosomes.
      • Chromosomes line up at the middle of the cell.
      • Sister chromatids separate.
      • New nuclei form, and cytoplasm divides.
    • Meiosis: specialized cell division for creating gametes.
      • Results in 4 daughter cells with half the number of chromosomes as the parent cell (haploid).
      • Two stages: Meiosis I and Meiosis II
      • Includes crossover: exchange of chromatid segments between paired homologous chromosomes
      • Genetic variation
      • Random distribution of homologous chromosomes

    Gametogenesis

    • Spermatogenesis (male): production of sperm, begins at puberty, occurs continuously, takes place in the seminiferous tubules of the testes.
    • Oogenesis (female): production of eggs, begins before birth, occurs cyclically, takes place in the ovaries.
    • These processes have multiple stages, important for cell division and maturation, and each has distinct phases and timing.

    Transport (Reproduction)

    • Sperm travels from the epididymis to the vagina via peristaltic movement.
    • Secretions from glands form semen.
    • Millions of sperm are produced (200 - 600 million).
    • Sperm mobility is high.
    • Oocyte moves through the Fallopian tubes.
    • Fimbriae aid movement and guidance.

    Fertilization

    • Fusion of male and female gametes
    • Occurs in the ampulla of fallopian tube.
    • Sperm must penetrate the corona radiata and zona pellucida.
    • Fusion triggers completion of meiosis II in the egg
    • Formation of the zygote.

    Cleavage of the Zygote

    • Repeated mitotic divisions of the zygote.
    • Formation of blastomeres
    • Blastomeres compact.
    • Morula
    • Blastocyst
    • Implantation: blastocyst implants in the uterine endometrium.
    • Blastocyst has two main parts:
      • Trophoblast outer layer
      • Inner Cell Mass (embryoblast): will develop into the embryo.
      • Blastocyst is in the uterine cavity for about 5 days
      • The zona pellucida degrades

    Blastogenesis

    • Early stages of embryo development
    • Formation of the blastocyst with the 2 main cell groups (trophectoderm and inner cell mass).
    • Zygote undergoes division forming a blastula and then blastocyst to implantation in uterine wall.

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