If both loci for blood are AO, the

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If both loci for blood are AO, the person is said to have blood group A. Only if both loci are empty does the person have blood group O. When the allelic genes are identical, the person is said to be homozygous for that gene or a homozygote. When the genes are different, the person is said to be heterozygous for that gene or a heterozygote. If a gene can express its effect clinically with a single dose (heterozygous), as in the combination AO (which equals blood group A), the characteristic is dominant. If the gene needs a double dose to exhibit its action (homozygous), the resulting characteristic is said to be recessive.

If Both Loci for Blood Are AO, the