They're both homozygous.
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If they are both homozygous, then the A parent is AA and produces A gametes; the O parent is ii and produces i gametes:
_____A___
i____Ai___← all children heterozygous type A
_____A___
i____Ai___← all children heterozygous type A
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assuming homozygous for the Rh factor (+/+) or (-/-), as well,
All children would have blood type (phenotype) A+
All of them would have a blood genotype of AO +/-
All children would have blood type (phenotype) A+
All of them would have a blood genotype of AO +/-
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homozygous:
1 parent: I^A I^A
2 parent: ii ii
A for all.
1 parent: I^A I^A
2 parent: ii ii
A for all.