Q bank question..please explain

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Posted by adk from IP 68.54.167.106 on March 30, 2006 at 13:59:42:

A man and woman are both affected by an autosoma; dominant disorder that has 80% penetrance in all affected individuals.Thay are both heterozygotes for the diseae-causing mutation.What is the probablity that they will produce phenotypically normal offspring
A 20%
B 25%
C 40%
D 60%
E 80%

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