From basic understanding of bio a co-dom is a trait that is shared by 2 different types of alleles. It shows signs of both genes.
Dom you only need one allele of that gene for it to show and recessive you have to have both alleles for it to show.
Co-dom breeding to me seems comfusing but I think that the co-dom gene are just already together and that is how they figure it out. I think it acts like a recessive gene. But I am not sure. Correct me if I'm wrong.
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