It depends on the mothers genotype for the ABO system. Genotype is what happens at the gene level as her phenotype (what she expresses as a result of her genotype as a whole) is A.
Each parent donates one half of the child's genotype.
In the ABO system, A and B are co-dominant over O (O stands for Lack of Antigen).
Meaning if you have a genotype of A/O you will be A.
Below is a list of possible genotypes and their phenotypes (what the person's blood type will be)
Genotype Phenotype (Blood Type)
A/A A
A/B AB
A/O A
B/B B
B/O B
O/O O
The mother either has a genotype of A/O or A/A (one from each of her parents) if she has an A bloodtype.
Providing the father is definitely O,
If she is A/A, all of her children will be A (child's genotype is A/O)
If she is A/O, there is a 50% chance of her children being O (child's genotype - O/O) and 50% A (Genotype A/O)
The child be will be rhesus positive as their is only one locus for the gene and it is dominant.
(You can only become rhesus negative if both parents are Rhesus Negative.
Genotype Phenotype (Rhesus)
Pos/Pos Pos
Pos/Neg Pos
Neg/Neg Neg
No they can not. two positives do not make a negative
Yes. The father's phenotype is AO+*; the mother's is OO--.
No. For two reasons: an "A" and an "O" can never produce "B," and positve blood types will never yield a negative one.
It would all depend on the Dominant and Recessive blood type genes in the mother and father it is near improbable to tell unless you take a blood sample to test the blood type. == A rhesus negative mother and positive father can produce either a rhesus negative or positive child. A type A and type O parental combination will only produce either type A or type O children. So an A- mother and O+ father will normally produce offspring having the possible blood groups of A+ or A- or O+ or O-. See the link for a full explanation.
No
Yes.
Yes.
YES
# yes, if father is + - for RH and mother - - (negative) or + - (positive); the father can generate sons A, B, or AB depending by mother's group.
yes
Yes.
Yes
Yes. The father's phenotype is AO+*; the mother's is OO--.
No they can not. two positives do not make a negative
yes, the mother could o negative
Yes. The father's phenotype is AO+*; the mother's is OO--.
the baby may be A or O.