Multiple Pregnancies and Birth Defects
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Questions and Answers

What is the science that studies structural disorders present at birth?

  • Dysmorphology
  • Genetics
  • Embryology
  • Teratology (correct)
  • What is the most common form of identical twin pregnancy?

  • Monozygotic twins with separate chorionic sacs
  • Monochorionic diamniotic twins (correct)
  • Dizygotic twins
  • Monozygotic twins with different placenta
  • What serves as clues for diagnosing more serious underlying defects in newborns?

  • Major congenital anomalies
  • Minor congenital anomalies (correct)
  • Microcephaly
  • Cleft lip and palate
  • What accounts for approximately 30% of major birth defects?

    <p>Mutant genes</p> Signup and view all the answers

    Which type of twins are at risk of Twin-to-twin transfusion syndrome (TTTS)?

    <p>Monochorionic diamniotic twins</p> Signup and view all the answers

    In which type of twins does Twin-to-twin transfusion syndrome (TTTS) occur?

    <p>Monochorionic Monoamniotic twins</p> Signup and view all the answers

    During which stage are most monozygotic twins formed?

    <p>Later developmental stage</p> Signup and view all the answers

    What is the term used to describe structural, behavioral, functional, and metabolic disorders present at birth?

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

    What accounts for approximately 55% of major birth defects according to the text?

    <p>Combination of genetic and environmental factors</p> Signup and view all the answers

    What is the incidence of major birth defects in newborn infants according to the text?

    <p>2-3%</p> Signup and view all the answers

    Which type of twins can have a shared chorionic sac and placenta if implanted close to each other?

    <p>Dizygotic (Fraternal) twins</p> Signup and view all the answers

    When does the division of a zygote into two, each developing into separate embryos occur in monozygotic twins?

    <p>Two-cell stage to morula stage</p> Signup and view all the answers

    At what stage will monozygotic twins have separate chorionic sac and placenta?

    <p>Two-cell stage to morula stage</p> Signup and view all the answers

    When does the inner cell mass split in monozygotic twins?

    <p>Early blastocyst stage</p> Signup and view all the answers

    At which stage do monozygotic twins have the same chorionic sac and placenta but separate amniotic cavity?

    <p>Early blastocyst stage</p> Signup and view all the answers

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