No. Two rhesus-negative parents cannot have a rhesus-positive child.
For a baby with AB blood type : both parents could be AB. or one is AB and the other is B. or one is A and the other is B.
No. For a child to have AB, one parent must have either A or AB and the other must have B or AB. O is a recessive type to both, so neither parent has any of those bloodtypes; their child will be O.
Yes, it is possible for a mother with O blood type and a father with A blood type to have a baby with B blood type. This is because the A and B blood type alleles are dominant over the O blood type allele, allowing for the B blood type to be expressed in the offspring.
How is what possible? How is what possible?
possible, search it on google
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
How is what possible?
Anything is possible! I think it can be possible...
more possible, most possible
Whether or not it is possible, it DOES nothing.Whether or not it is possible, it DOES nothing.Whether or not it is possible, it DOES nothing.Whether or not it is possible, it DOES nothing.
possible
it's possible is translated in French as "c'est possible"