With the help of given pedigree find out the probability for the birth of a child having no disease in F3 generation. 
One parent = affected (aa), other = carrier (Aa)
Cross → aa × Aa
aa parent gives only a
Aa parent gives A or a
Offspring:
Aa (unaffected carrier)
aa (affected)
Probability of unaffected child = 1/2
Given pedigree represents inheritance of myotonic dystrophy which is an autosomal dominant disorder.
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