The mother's blood type is O
Mother blood type is O, she will lack both the A and B alleles. For her to be Rh- she must have both recessive types. If M is co-dominant and there is no N's anywhere, then she must have at least one M. So mom's genotype would be:
O/O, r/r, MM or MN (incidentally, since O is not a recessive allele but rather the lack of an allele, the genotype for O is often written -/-)
Father blood type is A, he must have A alleles. To be Rh+ he must have at least one R. Again, he is type M and we do not see an N present anywhere so dad must be:
A/A, R/R or R/r, and MM or MN
Mom: ii rr MN, both O and Rh- are recessive and occur in homozygous condition
Dad: IAiRrMM or [tex]I^{A} I^{A} RrMM[/tex], father is heterozygous for Rr genes, as child is Rh-
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