Fertilisation Process Overview
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Questions and Answers

What is the main criterion used in dividing the human embryonic period into Carnegie stages?

  • Age in days
  • Embryonic length
  • Morphological features (correct)
  • Number of somites present
  • In the context of embryonic development, what do Carnegie stages primarily focus on?

  • Number of cell divisions undergone by the embryo
  • Exact age of the embryo
  • Morphological development of the embryo (correct)
  • Physical size of the embryo
  • What is the role of somites in determining Carnegie stages?

  • Gastrulation process
  • Age determination
  • Size of the embryo
  • Morphological development (correct)
  • Which of the following is NOT a factor considered when classifying human embryonic development into Carnegie stages?

    <p>Presence of neural tube</p> Signup and view all the answers

    What key aspect of embryonic development is directly tied to the division into Carnegie stages?

    <p>Morphological features</p> Signup and view all the answers

    What is the function of acrosin and neuaminidase during fertilisation?

    <p>Assist in passage through zona pellucida</p> Signup and view all the answers

    What is the purpose of the zona reaction during fertilisation?

    <p>Prevents polyspermy</p> Signup and view all the answers

    What happens to the tail of the sperm during fertilisation?

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

    What is the result of the fusion of female and male pronuclei during fertilisation?

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

    What is the primary function of trophoblast during early human embryonic development?

    <p>Embryonic part of the placenta</p> Signup and view all the answers

    What event marks the beginning of implantation in human embryonic development?

    <p>Disappearance of zona pellucida</p> Signup and view all the answers

    During which period of human development do all major organs form?

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

    At what stage does the heart start pumping in a developing human embryo?

    <p>29 day embryo</p> Signup and view all the answers

    Which type of developmental abnormalities usually involve small DNA mutations affecting individual or a few genes?

    <p>Congenital abnormalities</p> Signup and view all the answers

    Which of the following is a major chromosomal abnormality characterized by an extra chromosome 21?

    <p>Trisomy 21</p> Signup and view all the answers

    Which term refers to abnormalities derived from lifestyle, environment, and nutrition during pregnancy?

    <p>Maternal derived abnormalities</p> Signup and view all the answers

    At what stage in human development are all major organs already in place?

    <p>8 weeks old</p> Signup and view all the answers

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