lampbrush chromosome

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A large chromosome found especially in the immature eggs of amphibians, consisting of two long strands that form many brushlike loops along the main axis of the chromosome.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun genetics A form of chromosome formed of a series of chromomeres with large chromatin loops extended laterally