| 1. | Of these, Trisomy 21 and Trisomy 18 are the most common.
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| 2. | A well-known example of trisomy is trisomy 21 or Down syndrome.
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| 3. | Lejeune's colleague, Marthe Gautier, disputes his claim as the first discoverer of trisomy 21.
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| 4. | The term " trisomy 21 " is also used frequently.
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| 5. | However, the progeny of this carrier may inherit an unbalanced trisomy 21, causing Down syndrome.
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| 6. | Some cases have been reported of people with Down syndrome having children with trisomy 21.
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| 7. | One recent study showed that 77 % of Parisian fetuses diagnosed with trisomy 21 were aborted.
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| 8. | Medical literature reports four tetra-X pregnancies, two healthy, one with trisomy 21, one stillborn with omphalocele.
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| 9. | The frequency of Trisomy 21 has been determined to be a function of Advanced maternal age.
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| 10. | The child displays classic dysmorphic features found in genetic mutations such as trisomy 21, commonly known as Down's syndrome.
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