heterogenote

[hĕt′ə-rō-jēnōt′]
n.
  1. A microorganism containing an exogenous piece of genetic material that differs from the corresponding region of its original genome, but in a limited way resembles a heterozygote.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.