Ask A Scientist Molecular Biology Archive

name         Michelle
status       student
grade        9-12
location     PA

Question -   What is a human example of incomplete dominance and 
co-dominance?
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A good example of codominance is human blood type.  Specifically the
alleles that confer A and B blood types are codominant; the allele
conferring type O is recessive to the A and B alleles.
A good example of incomplete dominance is sickle cell disease.
Homozygous recessive individuals have sickle cell disease; heterozygous
individuals exhibit a mild version of the disease; homozygous dominant
individuals are normal.  

Christopher Perkins
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