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sometimes you can get multiple ......... for a single gene?

what are the 4 potential blood groups humans can have?

how many different alleles does the gene for blood type have?
what are they?

what is meant by codominance?

what two alleles for blood type are codominant?
what blood type will this genotype have?

which allele for blood type is recessive?

how do you get blood type O?

will organisms of the same species look slightly different?

what are these differences called

define genetic variation