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.