Fertilization in Animal Cells
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Questions and Answers

What is the fertilization membrane made up of?

  • Chorion
  • Blastocoel
  • Vitelline membrane
  • Chorion and vitelline membrane (correct)

    • What is the fate of the blastocoel at the end of gastrulation?

  • It remains as a hollow cavity
  • It becomes a morula
  • It turns into the fertilization membrane
  • It is obliterated (correct)

    • What determines the stage of the embryo in early cleavage stages?

  • Shape of the cells
  • Color of the cells
  • Number of cells (correct)
  • Size of the cells

    • What is characteristic of a Morula stage embryo?

    <p>16-32 cells resembling a mulberry</p> Signup and view all the answers

    What secretes the fertilization membrane in the ovary?

    <p>Follicle cells</p> Signup and view all the answers

    What is distinctive about the gastrula stage?

    <p>Open cavity formed by invagination</p> Signup and view all the answers

    Where does fertilization occur in Ascaris females?

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

    What is the diploid number in Ascaris?

    <p>2n=4</p> Signup and view all the answers

    What is the result of fertilization in animal cells?

    <p>Cleavage and gastrulation</p> Signup and view all the answers

    What part of the female reproductive tract in Ascaris enlarges to form the uterus?

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

    How do Ascaris reproduce?

    <p>Sexually with separate sexes (dioecious)</p> Signup and view all the answers

    Where do sperm cells enter the eggs during copulation in Ascaris females?

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

    What is the primary difference between the primary oocyte and the fertilized egg?

    <p>Presence of sperm head inside the egg</p> Signup and view all the answers

    What is the characteristic feature of the pronuclear stage?

    <p>Separation of homologous pairs</p> Signup and view all the answers

    What is the role of the male pronucleus in fertilization?

    <p>Generates an array of microtubules</p> Signup and view all the answers

    Which structure transforms into a pronuclei during fertilization?

    <p>Sperm head chromosome</p> Signup and view all the answers

    What is the main function of the fertilization membrane?

    <p>Envelops the first polar body</p> Signup and view all the answers

    At what stage does the nucleus of the ovum transform into the female pronucleus?

    <p>Pronuclear stage</p> Signup and view all the answers

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