Features of First Meiotic Division
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Questions and Answers

What is the term used to describe the segments in the head region of the paraxial mesoderm?

  • Sclerotome
  • Somitomers
  • Neuromeres (correct)
  • Dermomyotome

    • How many pairs of somites are present by the end of the 5th week of development?

  • 38 pairs
  • 40 pairs
  • 42 pairs (correct)
  • 45 pairs

    • Which part of the somite gives rise to the musculature of the limbs and body wall?

  • Myotome (correct)
  • Intermediate mesoderm
  • Dermatome
  • Sclerotome

    • What is the role of the dermatome in somite differentiation?

    <p>Supplies skin components</p> Signup and view all the answers

    What is the function of the sclerotome in somite differentiation?

    <p>Gives cartilage and bone component</p> Signup and view all the answers

    Which part of the somite forms the vertebral column later in development?

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

    What is the primary role of Type A spermatogonia in spermatogenesis?

    <p>To act as a continuous reserve of stem cells</p> Signup and view all the answers

    During spermiogenesis, which of the following events does NOT occur?

    <p>Duplication of the nucleus</p> Signup and view all the answers

    Which hormone is primarily responsible for stimulating spermatogenesis?

    <p>Both LH and testosterone</p> Signup and view all the answers

    What is the function of the Sertoli cells during spermatogenesis?

    <p>To provide support, nutrition, and assist in sperm release</p> Signup and view all the answers

    Which of the following is NOT considered an abnormality in male germ cells?

    <p>Normal size and shape</p> Signup and view all the answers

    What is the correct sequence of events during the first week of development?

    <p>Ovulation, fertilization, cleavage</p> Signup and view all the answers

    During the first meiotic division, what is the significance of the chiasma stage?

    <p>It represents the point at which homologous chromosomes exchange genetic material through crossing over.</p> Signup and view all the answers

    What is the primary function of the second meiotic division?

    <p>To separate sister chromatids into individual chromosomes.</p> Signup and view all the answers

    Which of the following statements about meiosis is incorrect?

    <p>It results in genetically identical daughter cells.</p> Signup and view all the answers

    What is the significance of the $30-40$ crossover events during meiosis I?

    <p>It increases the genetic diversity of the resulting gametes.</p> Signup and view all the answers

    Which type of chromosomal abnormality is characterized by the presence of an extra chromosome?

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

    What is the primary reason for the occurrence of meiosis before gamete formation?

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

    What is the functional layer of the endometrium called?

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

    Which part of the decidua is tightly attached to the chorion frondosum?

    <p>Decidua basalis</p> Signup and view all the answers

    What happens to the decidua capsularis as pregnancy progresses?

    <p>It soon becomes thin and degenerates</p> Signup and view all the answers

    What is the result of the fusion between the chorion leave and the uterine wall?

    <p>Obliteration of the uterine lumen</p> Signup and view all the answers

    What is the placenta composed of?

    <p>Chorion frondosum and decidua basalis</p> Signup and view all the answers

    What is the purpose of the septa formed from the decidua in the placenta?

    <p>To divide the placenta into cotyledons</p> Signup and view all the answers

    Which of the following statements about the incidence of teratomas is correct?

    <p>Teratomas have an incidence of 1:37,000, making them the most common tumors in newborns.</p> Signup and view all the answers

    During which period of development do the three germ layers give rise to specific tissues and organs?

    <p>Embryonic period</p> Signup and view all the answers

    Which of the following statements about the molecular basis of neurulation is correct?

    <p>If Bone morphogenic protein (BMP-4) is absent or inactivated by proteins present in the primitive node and notochord, the area of ectoderm overlying the notochord becomes thick and transforms into the neural plate.</p> Signup and view all the answers

    Which of the following statements about the closure of the neural tube is correct?

    <p>The connection of the tube with the amniotic cavity is ended when the cranial neuropore is closed at 25 days and the caudal neuropore at the 27th day.</p> Signup and view all the answers

    Which of the following structures arise from the dilated cephalic part of the neural tube?

    <p>Brain vesicles</p> Signup and view all the answers

    Which of the following derivatives arise from neural crest cells?

    <p>Craniofacial skeleton, neurons for cranial ganglia, glial cells, melanocytes, arachnoid and pia mater</p> Signup and view all the answers

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