What is the likelihood that their 1st living child will be normal height?

Biology
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two dwarfs with achondroplasia decide to have children. What is the likelihood that their 1st living child will be normal height? 

I think it would be 1/3 because 

    D    d

D| DD  Dd

d| Dd    dd

if their genotypes are (dd) then it would be lethal so I didnt include them

May 5th, 2015

Achondroplasia is an autosomal dominant disorder. The lethal genotype is DD, and dd is a normal genotype. So, if we do not include DD genotype, then the likelihood that their 1st living child will be normal height is really 1/3.

May 5th, 2015

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May 5th, 2015
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May 5th, 2015
Dec 5th, 2016
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