The observation that in some circumstances, the heterozygotes in a population have higher fitness than the homozygotes; for example they grow better, are better able to survive, and/or are more fertile than the homozygotes. The effect of heterosis can also apply to hybrids (thus "hybrid vigor").
Selected heterosis links:
© 1997-2006 Healthboard.com.
Healthboard.com is a purely
informational website, and should not be used as a substitute
for professional legal, medical or technical advice.