if the blood group of father is A+ and the blood group of mother is O+ then is it possible that the blood group of child is A- . if yes then state the reason . experts answer it asap

Solution :

The man with blood group A can have genotype either
IIA or IIO and woman with blood group O will have IIO genotype.

In the first case, if man has genotype 
IIA then the offsprings will have only A blood group. This can be depicted by the following cross:

Parents         IIA       x        IIO 

Gametes         
IA                   IO

Offspring              
II
So, the offspring will have blood group A. 


In the second case, if man has genotype IIO then the offsprings will have only A and O blood group.​
Parents                        IA  IO      x        IIO 

Gametes                    
IA , IO              IO

Offspring                    
IIO   and  IIO 
So, the offsprings would have blood group A and blood group O. 


Now, + or - blood group depends on the Rh factor. As both parents are  Rh+ so the offsprings will also be Rh+.
Hence the blood group of progeny cannot be A-
 
 

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