polytene chromosome
(redirected from Balbiani ring)Also found in: Medical.
polytene chromosome
[′päl·i‚tēn ′krō·mə‚sōm] (genetics)
A giant, multistranded, chromosome produced by multiple sounds of endoreduplication and thus composed of many copies of the parental chromosome pair having their chromomeres in register. Also known as Balbiani chromosome.