Answers

2016-08-02T23:30:01+08:00
Because the other have blood type o
the alleles of its parents are the same recessive.
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2016-08-03T15:47:21+08:00

in this case the parents both mother and father are heterogenous type A.

showing this in punnet square

                     A               O

A                 AA            AO

O                AO            OO                   as you can see there is 25% possibility of

                                                             having a type O child abd 75% having

                                                             typeA

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