Kindly solve No.3 problem

Dear student,
Thalassemia is an autosomal recessive trait. 
A normal but carrier male will have Aa kind of genotype 
A normal but carrier female will also have Aa kind of genotype.
A cross between the two will be as follows - 
 
  A a
A AA Aa
a Aa aa
 
Thus , 1/4 children will be thalassemic. Or 25% (aa)
Regards
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