robertsonian translocation

[rŏb′ərt-sōnē-ən]
n.
  1. A breakage in the short arms of two acrocentric chromosomes and the subsequent fusion of the long arms into a single chromosome.centric fusion
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.