| 1. | Ring Chromosome 20 syndrome is thought to be an underdiagnosed condition.
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| 2. | A circular structure called ring chromosome 7 is also possible.
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| 3. | A ring chromosome occurs when both ends of a broken chromosome are reunited.
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| 4. | Ring chromosome 14 syndrome is almost never inherited.
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| 5. | A chromosome is rearranged to give a ring chromosome, and a linear chromosome.
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| 6. | Morgan discovered the attached-X and ring chromosomes in " Drosophila melanogaster ".
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| 7. | Morgan's second major contribution to the " Drosophila " genetic toolkit was the discovery of ring chromosomes.
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| 8. | The other common mechanisms that can give rise to Down syndrome include : a Robertsonian translocation, isochromosome, or ring chromosome.
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| 9. | As chromosomes occur in pairs, the affected individual usually has one normal chromosome and the other replaced by a ring chromosome.
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| 10. | The neocentromere can either appear on the linear chromosome or on the ring chromosome, depending on which ever one lacks a centromere.
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