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Questions and Answers
What percentage of trisomy 21 pregnancies conceived end as spontaneous abortions or stillbirths?
What percentage of trisomy 21 pregnancies conceived end as spontaneous abortions or stillbirths?
- 90%
- 50%
- 20%
- 80% (correct)
What is the approximate incidence of Down syndrome amongst livebirths?
What is the approximate incidence of Down syndrome amongst livebirths?
- 1/25000
- 1/8000
- 1/800 (correct)
- 1/1000
What is the most common cause of trisomy 21?
What is the most common cause of trisomy 21?
- Nondisjunction event (correct)
- Genetic inheritance
- Environmental factors
- Mutations
What percentage of trisomy 13 conceptuses result in livebirths?
What percentage of trisomy 13 conceptuses result in livebirths?
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What is the approximate incidence of Patau syndrome amongst liveborn infants?
What is the approximate incidence of Patau syndrome amongst liveborn infants?
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What percentage of trisomy 18 conceptuses end as early spontaneous abortions?
What percentage of trisomy 18 conceptuses end as early spontaneous abortions?
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What percentage of spontaneous abortions will have trisomy 18?
What percentage of spontaneous abortions will have trisomy 18?
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What is the approximate incidence of Edward's syndrome amongst livebirths?
What is the approximate incidence of Edward's syndrome amongst livebirths?
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What percentage of stillbirths will have trisomy 21?
What percentage of stillbirths will have trisomy 21?
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What percentage of spontaneous abortions will have trisomy 21?
What percentage of spontaneous abortions will have trisomy 21?
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