Ring chromosome
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A ring chromosome is an aberrant chromosome whose ends have fused together to form a ring. Early observations of ring chromosomes were made during the development of cytogenetics in the early 20th cen
Representative karyotype from a well differentiated transitional cell carcinoma of the bladder. The chromosome indicated by "mar" represents unidentified marker, "r" represents ring chromosome. Arrowheads indicate breakpoints. Also evident are monosomy 9, 18, and X and trisomy 7.
Formation of a ring chromosome.
Mikhail Navashin
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Mikhail Sergeevich Navashin was a Soviet cytologist and cytogeneticist known for his work on plant chromosomes and chromosome evolution. He was among the first researchers to demonstrate chromosomal t
Ring chromosome
…melanogaster in 1926 that appeared “almost or entirely closed and somewhat rounded,” a structure later interpreted as a ring chromosome. In 1930, Mikhail Sergeevich Navashin described chromosomes in species of Crepis whose ends had fused to form a closed ring, providing the first explicit cytological description of ring…
Navashin's grave at Peredelkino Cemetery in Moscow