In the ABO blood system, the O allele produces: the A antigen the O antigen the homozygous blood type no antigen the B antigen
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The alleles involved are $I^A$, $I^B$, and $i$. $I^A$ codes for the A antigen, $I^B$ codes for the B antigen, and $i$ codes for no antigen. Show more…
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The gene that determines ABO blood type group has three alleles. IA makes A antigen, IB makes B antigen, IA and IB exhibit codominance dominance (both alleles are expressed when present). The third allele, i, is recessive to both IA and IB. A homozygous recessive person makes no blood type antigens and thus is blood type O.
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The ABO blood group is one set of antigens. There is a separate locus (H) that controls the production of these antigens. Individuals who are homozygous (hh) cannot produce antigens of the ABO type. Consider the following cross: AOHh x BOHh. What are the frequencies of the apparent blood groups among the offspring?
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