Genetics and Embryology Concepts
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Questions and Answers

What is the basis of biparental inheritance and variation in species?

  • Cleavage of the zygote
  • Fusion of male and female pronucleus (correct)
  • Formation of Pronucleus
  • Passage of sperm through Corona Radiata
  • Which event directly follows the penetration of the Zona Pellucida surrounding the Oocyte during fertilization?

  • Zonal reaction (correct)
  • Prevention of polyspermy
  • Formation of Pronucleus
  • Capacitation and Acrosomal reaction
  • What is the main function of the cortical granules present within the plasma membrane of the egg?

  • Prevent polyspermy
  • Promote cleavage of the zygote
  • Facilitate fusion of plasma membrane of sperm and oocyte
  • Hydrolyze the sperm receptor molecules in Zona Pellucida (correct)
  • Which process involves the breakdown of membrane to form a Zygote during fertilization?

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

    During which phase does the female nucleus undergo decondensation to form the female pronucleus in an oocyte?

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

    What is the purpose of the 'Capacitation' process that sperm undergo in the uterus and uterine tube?

    <p>To remove the glycoprotein coat and seminal proteins from the surface of the acrosome, preparing it for the acrosomal reaction</p> Signup and view all the answers

    What is the primary purpose of the Zona Pellucida surrounding the freshly released ovum?

    <p>To provide a protective barrier for the ovum</p> Signup and view all the answers

    What is the purpose of the 'Acrosomal Reaction' that occurs in sperm after capacitation?

    <p>To trigger the release of enzymes that will help the sperm penetrate the zona pellucida of the egg</p> Signup and view all the answers

    Which of the following is a key event that occurs during the fertilization process?

    <p>Capacitation of the sperm</p> Signup and view all the answers

    What is the purpose of the 'Zonal Reaction' that occurs in the egg after a sperm has attached and penetrated the zona pellucida?

    <p>To prevent other sperm from also penetrating the zona pellucida and fertilizing the egg (polyspermy)</p> Signup and view all the answers

    What is the primary function of the acrosomal reaction in the fertilization process?

    <p>To release enzymes that digest the Zona Pellucida</p> Signup and view all the answers

    How long does it typically take for a sperm to reach the uterine tube after ejaculation?

    <p>7-9 hours</p> Signup and view all the answers

    Which of the following events occurs immediately after the fusion of the sperm and ovum?

    <p>The ovum's metabolism is activated, initiating the development of the embryo</p> Signup and view all the answers

    What is the primary mechanism by which polyspermy (the fertilization of an ovum by multiple sperm) is prevented?

    <p>The ovum's plasma membrane becomes hyperpolarized, repelling additional sperm</p> Signup and view all the answers

    How long can a sperm typically survive in the female reproductive tract after ejaculation?

    <p>24-36 hours</p> Signup and view all the answers

    What is the process by which the bilaminar embryo is converted into a trilaminar embryo?

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

    Which of the following events occurs prior to the attachment of the blastocyst during implantation?

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

    What is the process by which a single-celled zygote undergoes a series of mitotic divisions to form a solid ball of cells called a morula?

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

    What is the term used to describe a situation where different cells within an organism have different genetic compositions, resulting from a mutation or the introduction of a different cell during early development?

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

    Which of the following processes is responsible for preventing the entry of multiple sperm into an ovum during fertilization?

    <p>Cortical reaction</p> Signup and view all the answers

    Which of the following cell types was used to demonstrate the proof-of-principle experiment for rescuing a sickle cell anemia mouse model?

    <p>Hematopoietic progenitors</p> Signup and view all the answers

    What is a major challenge for grafting hESC-derived cardiomyocytes in a model of myocardial ischemia?

    <p>Achieving sufficient scale of cell production</p> Signup and view all the answers

    Which cell type was shown to exhibit 'immature character' when differentiated from induced pluripotent stem cells (iPSCs)?

    <p>Cardiac myocytes</p> Signup and view all the answers

    What is a key advantage of using induced pluripotent stem cells (iPSCs) compared to embryonic stem cells (ESCs) for disease modeling?

    <p>Ability to model diseases in the Petri dish</p> Signup and view all the answers

    Which of the following approaches is mentioned as an alternative to using retroviruses for reprogramming somatic cells into induced pluripotent stem cells (iPSCs)?

    <p>Small molecules, modified-RNA, proteins, miRNA</p> Signup and view all the answers

    What is the process of directly differentiating cardiac fibroblasts into cardiac myocytes called?

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

    Which factor is NOT involved in the direct differentiation of cardiac fibroblasts into cardiac myocytes?

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

    Which type of cells can be transformed into pancreatic beta cells according to the text?

    <p>Pancreatic exocrine cells</p> Signup and view all the answers

    Which of the following types of cells can be derived from skin fibroblasts?

    <p>Hematopoietic progenitors</p> Signup and view all the answers

    In the study mentioned, what combination of factors induced cardiac gene expression in cells?

    <p>Three Transcription Factors</p> Signup and view all the answers

    What is the main function of hematopoietic progenitors?

    <p>Producing blood cells in different stages of life</p> Signup and view all the answers

    Which cell type is responsible for cardiomyocytes differentiation?

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

    What does the term 'transdifferentiation' refer to in stem cell research?

    <p>The direct differentiation of one specialized cell type into another</p> Signup and view all the answers

    What is a key characteristic of pancreatic beta cells?

    <p>Producing insulin in response to blood glucose levels</p> Signup and view all the answers

    Which type of stem cell is primarily involved in motor neurons development?

    <p>Embryonic stem cells</p> Signup and view all the answers

    What is the main advantage of using patient-specific embryonic stem cells (ES cells) derived through somatic cell nuclear transfer (SCNT)?

    <p>The ES cells would be genetically identical to the patient, reducing the risk of immune rejection.</p> Signup and view all the answers

    What is the main ethical concern associated with the use of human embryonic stem cells derived through SCNT?

    <p>The limited supply of human eggs available for the SCNT procedure.</p> Signup and view all the answers

    What is the primary advantage of induced pluripotent stem cells (iPSCs) over embryonic stem cells derived through SCNT?

    <p>iPSCs can be derived without the destruction of embryos, avoiding ethical concerns.</p> Signup and view all the answers

    Which of the following cell types could potentially be derived from patient-specific embryonic stem cells obtained through SCNT?

    <p>All of the above.</p> Signup and view all the answers

    What is the process by which a non-pluripotent cell can be directly converted into another cell type without going through an intermediate pluripotent state?

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

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