How do blood types combine?

Can someone with A+ blood type and someone next to A- blood type, produce a child with B- type or O- type? Two folks with type A blood cannot produce a child beside type B blood, but they can produce a child with type O blood.
In blood type, A and B are co-dominant, and O is recessive. You inherit a gene from respectively of your parents, and they must both be O in direct for you to have type O blood. The same is not true beside A and B. Those types show themselves if you only inherit one gene for any one.
In your example, both parents have type A blood. The possible gene combinations (or genotypes) to produce type A blood are AA and AO. If two empire who are both AO have a child, and both parents donate the O to their brood, the offspring will own type O blood.
When it comes to rh factor (the + and -), + is dominant, and - is recessive. An A+ and A- couple can produce an O- child if the A+ parent carries the - gene.
One point to note is that if we're discussion about a unadulterated life example, be severely concerned about the rh factor of the mother and the child. If the mother have a different rh factor from the child, there could be serious problems near the pregnancy.
I hope that was not overly complicated for you.