Well, let's see here.
I believe incomplete dominance was when a trait attached to a particular gene can be mixed. For example, if you breed a white flower with a red flower and you get a pink flower, that's incomplete dominance.
Codominance means that there are two genes which are attached to a trait. Let's see there is a gene in rabbits that determines whether or not they are white. If the gene is expressed, the rabbit will be white. If not, the rabbit may still be white depending on the other gene. That one will make the rabbit brown if expressed. So in order to have a brown rabbit, the white gene must not be expressed and the brown gene must be expressed. If the white gene is expressed, the rabbit is white regardless of the brown gene. If the brown gene is not expressed, the rabbit is white regardless of what the white gene says.
Something like that. Biology was a long time ago...
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