isochromosome

noun

iso·​chro·​mo·​some ˌī-sə-ˈkrō-mə-ˌsōm 

-ˌzōm

: a chromosome produced by transverse splitting of the centromere so that both arms are derived from the dyad on one side of the centromere of the parental chromosome and each arm has identical genes arranged in the same order counting away from the centromere

Word History

First Known Use

1939, in the meaning defined above

Medical Definition

isochromosome

noun

iso·​chro·​mo·​some -ˈkrō-mə-ˌsōm, -ˌzōm 

: a chromosome produced by transverse splitting of the centromere so that both arms are from the same side of the centromere, are of equal length, and possess identical genes