Abnormal Zygotes and Spontaneous Abortion
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Questions and Answers

What percentage of pregnancies are estimated to end in spontaneous abortion?

  • 10%
  • 75%
  • 25%
  • 50% (correct)

    • When are abnormal zygotes usually lost?

  • 2 to 3 weeks of fertilization (correct)
  • 4 to 6 weeks of fertilization
  • 7 to 8 weeks of fertilization
  • 1 to 2 weeks of fertilization

    • What proportion of pregnancy losses are a result of chromosomal abnormalities?

  • Two-thirds
  • One-third
  • Half (correct)
  • Three-quarters

    • Which condition is characterized by a partial deletion of the short arm of chromosome 5?

    <p>Cri-du-chat syndrome</p> Signup and view all the answers

    What is the approximate incidence of trisomy 18 in newborns?

    <p>1 in 5,000</p> Signup and view all the answers

    Which abnormality is associated with a cat-like cry, microcephaly, and congenital heart disease?

    <p>Cri-du-chat syndrome</p> Signup and view all the answers

    What percentage of trisomy 13 infants die within the first month after birth?

    <p>&gt;90%</p> Signup and view all the answers

    What is a common feature observed in patients with trisomy 18?

    <p>Low set ears</p> Signup and view all the answers

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