Question about BLLOD TYPEs [A+ plus A- = ?]

[leder at rcf.rsmas.miami.edu]

Hello!
Here is a hopefully easy question for someone out there:
I would like to know what are the possible blood types of a child
of parents who are A+ and A- ?  Very Important! Thanks for your response.

Actually- here's another: When bllod typing is used (or was before DNA testing
?) in paternity suits-are they checking this A+,B,O-etc or is it 
something else?  Can blood type be used for that purpose?

Thanks in advance.  
Jim L