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There are multiple alleles for the ABO blood group. Why are there only two of these alleles normally present in any one indiv
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In this case, each parent will pass to the offspring only one allele and the child will have a combination of two alleles. For example a mother with type A blood will pass the allele for A and the father can pass the allele B or A depending of his genotype. So, the correct answer is 1.

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