A woman with type A blood may have genotype AO or AA. The heterozygous type is AO.
The woman would have blood type A. A genotype of IA indicates the presence of the A antigen on red blood cells.
The woman would have genotype AO (IAIA) for blood type A, the man would have genotype BO (IBIB) for blood type B, and their child with blood type O would have genotype OO (ii). The child inherited one O allele from each parent.
The genotype of the man is A negative/O negative inheriting the A neg from his mother and O negative from his father. [Father's genotype is B positive/O negative. Mother's genotype is B positive/A negative.]
Yes.
Xi or just X depending on how you want to write it
There are three alleles for blood type which can be represented by IA, IB, and i. A person with blood type O has the genotype ii. A person with blood type AB has genotype IAIB. If these two people produce children, those children will inherit one allele from each parent. They will therefore certainly inherit the i allele from their mother and either the IA or the IB from their father. The children with the genotype IAi will have type A blood, since the IA allele is dominant to the i allele. The children with the genotype IBi will have type B blood, since the IB allele is also dominant to the i allele.
Depending on their actual genotypes and which of those genes the offspring receive, their offspring might have AB, A, B, or O blood type. For the man to have a phenotype blood type A he might have either genotype AA or Ao. For the woman to have a phenotype blood type B she might have either genotype BB or Bo.
She is a carrier of hemophilia but does not have the condition
If all the children are AB, then one parent is AA and the other is BB.
If an AC genotype man and an AS genotype woman marry, each of their children has a 25% chance of being born with a sickle cell disease (SS genotype), a 50% chance of being a carrier like their parents (AS genotype), and a 25% chance of having a normal genotype (AA).
Yes. The woman has a genotype of BO. Each child is a "reset" of the 50/50 probability of being group O or group B.
Yes. If the father is AO instead of AA (both of which are 'A' bloodtypes) and the mother is BO instead of BB (again, both simply called B), they can produce a child with type O blood. This website can illuminate the matter further for you: http://www.biology.arizona.edu/Human_Bio/problem_sets/blood_types/Intro.html