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    In co-dominance, I don't get why the symbols we use are different.

    eg. C-colour.
    R-red, W-white

    C^RC^R = red
    C^RC^W

    Whereas when not dealing with co-dominance, it's just
    RR = red
    WW = White

    Why can't you just do that, why do you need the 'C'?
    Or am I just reading too much into this and it's just to show that you're dealing with co-dominance
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    (Original post by ILoveUSA)
    In co-dominance, I don't get why the symbols we use are different.

    eg. C-colour.
    R-red, W-white

    C^RC^R = red
    C^RC^W

    Whereas when not dealing with co-dominance, it's just
    RR = red
    WW = White

    Why can't you just do that, why do you need the 'C'?
    Or am I just reading too much into this and it's just to show that you're dealing with co-dominance
    Well, it is common convention to denote dominant alleles with an upper-case letter and recessive alleles with a lower-case letter. It wouldn't make sense to do this with co-dominant alleles because neither has dominance over the other. The use of "C" for both alleles shows that they are alleles of the same gene, despite having different letters ("r" and "w"). I really wouldn't worry about it if I were you.
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    Codominance uses, like Ashnard said, same symbols because neither gene is dominant over the other. For instance, in the MN blood group system, if a child inherits I^M and I^N both then his genotype will be I^M*I^N.
 
 
 
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