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