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Say both parent and child are genotyped for all SNPs. In this setup we are only looking at variant positions between one parent and child - so neither parent nor child are homozygous reference (no AA/AA) in the millions of positions we are studying.

Assume all variants are biallelic and there is no de novo mutation (no AA/BB or BB/AA)

P    C
AA   AB
AB   AA
AB   AB
AB   BB
BB   AB
BB   BB

What is the fraction of AB/AB among these possibilites?

We are looking at all positions in the genome so the minor allele frequency (MAF) of B allele varies. You can choose whatever B frequency you like.

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2  
I'm a little confused: are the genotypes in the rows representing different loci or just different potential, non AA/AA scenarios of one locus? – Atticus29 Feb 5 '13 at 7:16
    
Potentials. I am going to go with 1/6, regardless of B's MAF. – Jeremy Leipzig Aug 4 '14 at 13:51

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