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Solution 

Codominance means that neither allele can mask the expression of the other allele.
An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB.

The cross between a heteozygous black coated rabbit CBc and a homozygous white coated rabbit CWCW is as follows - 
  CB c
CW CWCB (heterozygote) CWc (heterozygous white)
CW CWCB (heterozygote) CWc (heterozygous white)

Thus 50% progeny will be heterozygotes (showing both black and white patches on its coat Since white and black are codominant both black and white will be expressed)
while 50% will be heterozygous white. (since coat will be white but half alleles will be that of albino. Since white is dominant over albino, white will be expressed)

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