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Related to inbreeding depression: heterosis
A loss of vigor and general health that sometimes characterizes organisms that are the product of inbreeding.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
inbreeding depressiona reduction in viability resulting from increased homozygosity through INBREEDING.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005